Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7280a558b6d895…

MALICIOUS

PDF

81.6 KB Created: 2021-09-10 13:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e416ea830527d92f8539adc32d084b63 SHA-1: acac0791d9521536a949d500b88fec667638b0e5 SHA-256: fd7280a558b6d89580a15a3caf3ccce28a094c6852f992b38eebb45c521e24d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ikomsolutions.com/admin/userfiles/file/nuzumim.pdf In PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/44bdbc8e445a9e932eb979c7fc974cd3/44821396161.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/jegugunujef.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613260d0dc73d---97319583440.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/32078238262.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/vesekezagodatogobetazowu.pdfIn PDF document text
    • https://ottopianos.nl/files/sevazeviniranesiru.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/37279781247.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/2102233758.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/ganareguwatebosejire.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/kiwugar.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/gupevolu.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/pegodadilobafidafuz.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/50237092506.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/juvazimoki.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/64130668d6e1bf09b1f2ce5e7a0f3f41/32351949342.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/mobajobufa.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/19584503027.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613213673a6f4---20993812073.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/45012883685.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161302e5f0b4ef---vazufoxewuvob.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/wawenel.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/gasoroxavumepabemejijapoz.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f965d8d4ac---puwaferelim.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/88861455621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=9191+grant+stPDF 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_off0000dce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE5 10016 bytes
SHA-256: 25415707871dee719b709ac67e79be63e805045f7e5d3c9e7a67a2036a902c3d
font_01_sfnt_off0000f33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B50 17824 bytes
SHA-256: 5c41e068906832c5834a95f2ae798b5184cd5ead5a20eadd0d2bf97215058be8

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