Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef407f603e6d7dc…

MALICIOUS

PDF

92.8 KB Created: 2021-06-26 17:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a911917575ab8566886b8f63316e2da6 SHA-1: aa1f7ed06cc56977acc7ceade51ba5fbd7cdb2b7 SHA-256: eef407f603e6d7dceafecab35e1eb8f66cd8f81d0a751176fe2f77f92c9786b2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF is flagged as malicious by ClamAV and a machine learning classifier, exhibiting characteristics of a payment redirection lure. It contains numerous links to external PDFs hosted on compromised WordPress sites and disposable hosting, suggesting an attempt to distribute further malicious content or phish for financial details. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607316332a966---xomine.pdf In PDF document text
    • http://growlink.biz/userfiles/file/bibotamopasabiw.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/75e6a3eb7810a81b743ea2626fb2e055/vowusaminezufuf.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083a91572747---venuwisajaditerojed.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/likulu.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/656002b126ae6c9ddd763820545ab8ca/tejobogega.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1c78d0ad1---84811376860.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/fmameb45q68ri6tr9e5p91035c/72349317503.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/03a9e5774aa14d4c41374d0cbefe7ce0/23348356422.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/vemukudimekodozuzar.pdfIn PDF document text
    • https://arerp.kr/data/file///fuxaxipewoja.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/52128376933.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa57b3a8323---luvogafewuvi.pdfIn PDF document text
    • http://planbmedia.hufiles/topejedorukivu.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/a2f7fa4b42a1d3b803105184ee0abc12/rulabifiw.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d4042e350a6---1652050349.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6afc06fe1---59775765250.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160758f3f0c3b7---dolosuganokilimawe.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/e2cd3d3f75bc202bcdde7c00fd509b3f/komugegige.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099dfd0cde30---renasesemumoxikuwusobeb.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/53127277032.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/52ca633f68296df6d207cfa8a05baa74/12820208134.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f82eee9a---fasunupik.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/wutevuzorirakapamumogoku.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/48161076385.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160714dcc10abd---49712074389.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/pulatisaxixobuneravoralik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=examples+of+companies+that+use+job+order+costingPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10589 11520 bytes
SHA-256: 6a4c57b4e843bb17b4672c74f74516d1d4288b3e95d672c2fdb13c299443f46b
font_01_sfnt_off00012029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12029 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001383b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383B 17212 bytes
SHA-256: 1c5d2920748cfb9baac56c74b401dbceec339915dc342d862dd34602a1a785e4

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