Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4cb955dea696c96…

MALICIOUS

PDF

88.3 KB Created: 2021-06-26 21:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: eae3195510daebf6089bd780a4ca0ec1 SHA-1: 8d740fb524ebec99dfd57134bc39f0605cf41b10 SHA-256: a4cb955dea696c96cda2f6dbe66255943fa50f03869ed63a505e1e23787f3a14
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external resources, many of which are hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trendymamy.pl/userfiles/file/26076880019.pdf In PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/fp3mmdgl8nfb7uks6p77bot7t7/50259559873.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/8a18530db08f328375f3df8bd79b9bd1/kolexuxividurizebosotur.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba749efa77---wivudulidofanawonilakan.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1f4a50486---74279276944.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160702cbd1de90---6973984052.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/5a80e670b281f83c3cc3ac0eee54f5bf/reduvibobipanaxefa.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/unbe53fnnhpohvpoa4m3de7nlq/5821288624.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/sovasajisudalugazole.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/23e19d12da826ff39b09748f1bc1d59c/10130257387.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/7jucuivfaeas7pl3856suog8s4/66974163288.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/98429344677.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/e51c22ffbb10259146a6e657d43e407d/sufej.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/pidexi.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160754e4593b14---romur.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608371a137842---17067891701.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/vesorin.pdfIn PDF document text
    • http://xn--80an2aej.xn--p1ai/up/file/fazuk.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8317cc837---71116331585.pdfPDF link annotation
    • https://die-elke.de/cms/elke_page_files/file/pofimorivuwimod.pdfIn PDF document text
    • https://medtek.vn/storage/file/70968860719.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160987c2808e16---45125039630.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021062608424468.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/347b8fd252eba68e6e0a88071250e552/58782732004.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/67163052144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=bsc+nursing+1st+year+microbiology+notesPDF 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_off0000f703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF703 16536 bytes
SHA-256: 62abeefbf6b6219474e8b0cc61441d550dc4ae611f52c1c017ffa70d9342e6f0
font_01_sfnt_off000121f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A10 11032 bytes
SHA-256: 12ee237322c922b55086c0c69f65a8e699af99fd66327498f903f235530e9991

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