Malicious PDF — malware analysis report

Static analysis result for SHA-256 81dd7b0716c4ad2b…

MALICIOUS

PDF

99.6 KB Created: 2021-07-26 21:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 30b213871ff6326e8f1654cfdbe0c501 SHA-1: 6d270527643c2577205d183ae515c8d2c9531ef5 SHA-256: 81dd7b0716c4ad2b9e2036eb3bb2b350f2fcce0b88ed69bd59fd6c5f491c16e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, likely intended to lure users to phishing or malware sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://chung-pei.com/userfiles/file/74436190810.pdf In PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/fb89u05gie31apdetscc85e3tc/julov.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/bogolorewiruxigi.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/e2bqlgepgfaei8ga8aed9u00nb/3408668940.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/18557829449.pdfIn PDF document text
    • http://01host.ru/userfiles/files/vitizoxugupesawono.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/54c52d442cbb91c95a24c72f2cdfc42b/77311006778.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c033b1887f9---86882853694.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cdeb56856---nanoti.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/35122398038.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/065bb4d527ed2fc71197e453d8796e0a/rajakitomidug.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1606c902b71b28---83516679412.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021052304593673499.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/569fba72f2cfb92a73ea558930977850/73210823811.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/80251212544.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fd040aceb47---fuwazomos.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/47058306836.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/pigixunufifotuj.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/70641552805.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/438492ae452ff9cf82ade795b77b911f/88442341931.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec424b4b80c---xinezak.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/89574226353.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/8e24709550c246ccd30c07f94bd942f5/kajoxijuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=acta+constitutiva+de+una+asociacion+civil+en+mexico+pdfPDF 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_off00011d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D10 18692 bytes
SHA-256: c1bb8809a1da31070f6612051b93793d09ac7c32819a370ecffab44c78378dfe
font_01_sfnt_off00014c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C5E 10928 bytes
SHA-256: d7bb96b5c81d3320f09cbb17896bfeb7b0461cb6e36191b24a43adeacd423b07
font_02_sfnt_off000165ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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