Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bfb19cc8520e6f2…

MALICIOUS

PDF

106.0 KB Created: 2021-07-26 19:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ad17f87ae3a7e78f4f52b555c321e0e8 SHA-1: b1cdaa4a32a89e189e7e7a9fffe08026b0b2b0bd SHA-256: 0bfb19cc8520e6f2b0509b1f9b5c26b463831b8c3553134d5ad7480e251227a7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable domains, indicating a link farm designed to lure users to malicious content. ClamAV detected this as a phishing trojan, and the ML classifier also flagged it as malicious. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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 https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/e257bd919f1db7590b2f0bf9a9dd3872/46762404975.pdf In PDF document text
    • http://feach.ie/images/uploads/file/vivukok.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/vuzezesuvagowub.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/werosofumeziwovu.pdfIn PDF document text
    • http://attlas.center/userfiles/file/sibira.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608878b47067a---77650238688.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/hiiotjli4ti5d1glqee921tqcn/disajofusekun.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/07c258d4db30551d45b45e23bd901c23/20435633751.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/48124497549.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/3606898402.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad33abb20e8---78004662404.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/jda0ikq9f7frhjmvp59s6rlju0/bunopiwigawap.pdfIn PDF document text
    • https://drsaman.com/files/47686116078.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a49a597031---91763502592.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/8394bff70ae146b1d421a62f2f4dbcf8/zidonitomafaw.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/266811ccc199b0f454f3d5ce9972d2f9/64114541537.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/k3ulj8bj2jn2ciep4up1nfqcfc/35890197606.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/nekisakixufib.pdfIn PDF document text
    • http://hasyo.net/files/file/21997052162.pdfIn PDF document text
    • http://jerilyndavisrobison.com/clients/870655/File/76122529783.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/58679120537.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/rizowafamur.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/svqbas61pa61lo70ek3rh81mjq/42142736939.pdfIn PDF document text
    • http://dgjst.com/upfile/file/37181836483.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98765527ee---57942260887.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b05abc2eb36---wunufixid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=que+significa+hemoglobina+corpuscular+media+altaPDF 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_off0001325d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325D 20632 bytes
SHA-256: 407b9e9a1a07fee440f2b53f0e23b6199a047689aa5ec952fa224b9a85347ff9
font_01_sfnt_off0001656c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1656C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D83 11364 bytes
SHA-256: 092d303c286358da93da285fef1800392425f4875df22373f75f13c6f7cd51a0

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