Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9595abfce452921…

MALICIOUS

PDF

73.2 KB Created: 2021-05-28 22:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 24cfcafc7155b94e8bdb3a5b0eadec93 SHA-1: 7bd8a4d3cd4ea3f1c5a82a337bf8259c9ae75b05 SHA-256: a9595abfce452921236e0f4b76ead666c6e71d96a7d7a3d7cfe754f4473f107b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://wastran.ru/uplcv?utm_term=irregular+verbs+past+participle+exercise+pdf PDF link annotation
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/42e9tt6shkmvhrmh9216j4sljh/lusaxitetegafazozigufil.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a3ad60fc0---1022099899.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/639ffee962930361c008559b75dc779f/nuxowipuvinabitirizaxur.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca70176868---93403442464.pdfIn PDF document text
    • http://accessoriesunlimitedinc.net/catalog/file/76189594635.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/puwox.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/klqdm79eta027rv3vq83mu1971/monabotevek.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fe24cb19e---46369499568.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/84863542239.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/fbe882a2f8eb53480d7e57bccba79758/simeguvamuvumivobogapuf.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/66871265370.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/36a934f9f353930bcd639458f0a0fd38/riduvokikutujudagake.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/bqbeaba9ur6m1a9de48gsgai2r/14995547681.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c3c9511bd---31082256089.pdfIn PDF document text
    • https://paperland.bg/uploads/file/17905097781.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/81014721868.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079b19cc8214---dizejuragedixive.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B6 5192 bytes
SHA-256: 0aefca22964e54818d6fb4da72877b7390adbea0c5b0c85d7c8d126a6e5af31a
font_01_sfnt_off0000e472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE472 10736 bytes
SHA-256: d679baf43507d389d4217c43977afdd3c1c9773266fb48dadcdcd5a4234f0422
font_02_sfnt_off00010901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10901 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176