Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba8c5f2fb66a83d…

MALICIOUS

PDF

103.9 KB Created: 2021-09-01 08:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4e7bbb2131b296cca7ba4b1574973cff SHA-1: e5c0b162af4f53c04b58dc89232888b4158a8049 SHA-256: 8ba8c5f2fb66a83dd6837e71cb8610a585be5caa8615e8b2641df71ad9e84ed6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. The presence of these links suggests an attempt to redirect users to malicious content or phishing sites, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daddc068de8---sofezezuriwagoxatil.pdf In PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/korazagejolada.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/juwewamopewutixo.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/fiwajanuxogekemo.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/rumiketenewosom.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/wonulu.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/13170167182.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a787bb16ecc---lulaxujop.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/4e94e9a49936a852fe5d2e7cf2313641/74580713202.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/84118767323.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e8d8a08a1---jepilezexakisolivutiviv.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/016725548cc185c21b9f27efbc5e770e/77829647651.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/kamivamawugemulawulibiro.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9f3324f48---bezujadoxa.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/4b9b37eba526729b301dce4d4b8ec2db/kaxorafamiwezoriten.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/biretuvilaw.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/96457238694.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160767a1aad2b2---9626456894.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e03a47cb7d1---62495829510.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/nalilejewapipovixosuzimun.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/moroguvabofikiwine.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ln0acpr8snmrh29vh208o83t8e/13015863662.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0c5362cea---wivaxutulor.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/85879982568.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739ca40b17f---genez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=nearest+anglican+church+to+mePDF 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_off00012dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEA 18880 bytes
SHA-256: e0b795826a88e8b79665e617410411a609749181702568916a692905c550dec8
font_01_sfnt_off00015eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EEF 10752 bytes
SHA-256: 6bac4eb01a058cc4378a0ab2aa3fcd3752d8aac4209fb1bb358d924aa50c4cb0
font_02_sfnt_off0001777c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1777C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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