Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3a382ef1226b3e…

MALICIOUS

PDF

75.2 KB Created: 2021-09-11 12:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 709f764479022846c1545a8d5b4ceb2d SHA-1: 6632d06853082bb9ccafacd0a6b5de9e59a0ccd0 SHA-256: 5f3a382ef1226b3edb7bd948c891c9ddf4445647830109955c0cf5d06d2833c1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, suggesting it serves as a container for these malicious links rather than user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://daydreamspin.com/userfiles/file/77336115067.pdf In PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b86180445f---47344304917.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/wuturogoworubopobunivuk.pdfIn PDF document text
    • http://allasclub.com/campannas/file/14303934326.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/17461389724.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bec75016d7---36129046543.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/53003603838.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/32220114290.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/61969037737.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/98422877300.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/razodutunalenozitikok.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/tetazibejalupawuko.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/rorabolaponajijalejim.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/63296550639.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/fijujigekuwipalesekaxixe.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/jatuve.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/74644475298.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/zojofemevavuxelar.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/88552966222.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/2828326e85cc5c5ce494315a99e9c4b3/98481967172.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/21573017265.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/149871534.pdfIn PDF document text
    • https://12shio3.com/contents/files/tijosaxafim.pdfIn PDF document text
    • http://kmsenior.org/file/files/gozetekazokune.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/65359639316.pdfIn PDF document text
    • http://dytac.hk/userfiles/80065700466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=anecdotal+notes+for+teachers+examplesPDF 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_off0000c372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC372 16756 bytes
SHA-256: af469dbcc2a2fe2be6638e549720494411553fe1fc18a9e6809642debe6d9cd7
font_01_sfnt_off0000ee04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001061b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061B 10876 bytes
SHA-256: 3f8edf79d6ebcf50a1aa5e9b95af9cd0d1cc6dcd3ccf2707e5ab47fa8a737bef

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