Malicious PDF — malware analysis report

Static analysis result for SHA-256 d280ccbfe680e785…

MALICIOUS

PDF

102.4 KB Created: 2021-07-20 18:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 70b6dfd8c1b0316c67d62863e412fa71 SHA-1: 5058e90332318bd14e1d3f99f052ce3abac97406 SHA-256: d280ccbfe680e785beb107d63ef2d9e10f5a6d647363f3b3cc722ada60b6ad7d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The primary attack pattern involves luring users to click on these links, potentially leading to further compromise or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://auksozvynas.lt/userfiles/file/13380375535.pdf In PDF document text
    • http://altaprecision.com/userfiles/file/81302004872.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/17921366012.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/li2rdmbq61j6hgsk3373jlj1ab/79812115465.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fc0b91a30---nelepe.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/bscgtniqfethob9favdj83ftp1/35745565455.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087b42a70b8e---zopos.pdfIn PDF document text
    • http://planetamama.ru/files/file/56641441978.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160703a562b636---84392502043.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/mobebolopibe.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/74586863577.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/94482572580.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/0e1cfda622bebe4dc1a00ba360b53341/lajapibadasupuxapenolu.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160863e50a1205---36852131795.pdfIn PDF document text
    • http://dogninja.com/userfiles/files/podemonomitaguz.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/xavubix.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/29647875437.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/palosofugi.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/pasimod.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d785d4fa60c77c1c30e62197bc1c0c67/89970295335.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/73598240270.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/c36f51a079f1a5057c7e2e338bd6f1f2/najuligobaboxoze.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/eb90a1cbc5661fdc7575fb303eed26a8/19773219433.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/85768684164.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d190023f8f5---bunojawunivabefepakovow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=kind+words+that+start+with+iPDF 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_off00012e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001461a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1461A 10244 bytes
SHA-256: c5de826d9aef782c0bcda6553c3ee8b119062d94097b8c22ef1b5c44454af1e8
font_02_sfnt_off00015d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D0E 18184 bytes
SHA-256: f70e772f087cb8be5a0bb07f1277351bc97264fdb74e0da585c05e420a282fe3

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