Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a726a3cb064af1…

MALICIOUS

PDF

76.3 KB Created: 2021-06-30 21:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d171ffc1aa7e5838144f7b1abd633dab SHA-1: 64239967f377d558d20d77de05e82e737349580a SHA-256: 05a726a3cb064af1d83eb32af5cff867b21b733286ba7f5a60dcec7e1013fb16
196 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a Business Email Compromise (BEC) attack, specifically a payment redirection lure. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting an attempt to obscure the ultimate destination. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the presence of multiple links and the 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://shibbirs.com/media/files/kosimufinu.pdf In PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2700778481---82821529352.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfacaa319b---xenibixoxejunova.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c929e7b50---33353844323.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb83a3f50e---vowowotubekonovogudu.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/86212180691.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/65265970485.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/bobamedatas.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/oldnvrh8fuleiu01f2t2peaine/rofunoforo.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/lurobimodak.pdfIn PDF document text
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/81020465100.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/oacjfjk42lato622nhm5gjp91n/xeniripadigoneb.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070e360b6a69---9873466784.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/dded8ad92128dc03321c315920baae4d/fasixilabo.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607573932f60a---62311270608.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caeb7cf22e---36555020454.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/27978694367.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/rosawevu.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942f0958b29---kiparatefep.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/8agqbainjsfg4n2urlfemp252h/31366882940.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/48633d2c7e142bdfad7c3db11fc196f8/rusixufasuxome.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/k45kaptbppp97v8nb5657b6tiv/kotos.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79f6b9d23c---lozaletawabugewevevekag.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a403bbee3e---96804520287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+the+past+tense+of+payPDF 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_off0000c835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC835 17608 bytes
SHA-256: 7835da367e1a2710ecec37f14954740fdd2e572766e925d215c53215d2a73808
font_01_sfnt_off0000f441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF441 10416 bytes
SHA-256: f08ab4f55853ac9f2d4f6722cd6eee7f639766f8bb8325cfd959190d6308aec7
font_02_sfnt_off00010be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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