Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a90ab6e61cd962…

MALICIOUS

PDF

102.9 KB Created: 2021-06-27 08:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10c6d7fdf15525f01b368a270e1becfc SHA-1: a2f0fee2490fe466fa8245f70465479c5be6172b SHA-256: a8a90ab6e61cd962907354d2d7a174995d248c1d811a3397566b9866980797d8
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, which in turn host more PDFs. This pattern suggests a link farm designed to distribute malicious content or lead users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/63f6d9dd51ed224cba1bbea203599c37/90845143851.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a68bff0a4fd---13777860304.pdf
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/75684927205.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/fd742c5d4550f5bee954c7e809927e1d/dutipenoduzowerapoja.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078db95befc3---zifolugokizinamarurido.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a40af10e782---27448391992.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/0c38d7db29951e67201342bb92af591e/60719356432.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/d0106f72387c131c1c03ebcb01867614/fozunefeni.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa138610247---vuxogarasefitenewaga.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/55e179ff491516b1862351c006fdc3c5/zarizivetadim.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/0pbviqsg6jotqqqpiu6itqo0nc/66943495045.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfaa958d9f---43284193511.pdf
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/96473692453.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082fba2776a1---mutip.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070a9bd5551b---7687450195.pdf
    • http://akkoryazilim.com/userfiles/file/tiwumugodavematopejuf.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fd2392d5d---xijezuguw.pdf
    • http://bjeclinic.com/ckfinder/userfiles/files/94217605223.pdf
    • http://lyzebrno.cz/userfiles/file/jutijamuxitepusenelojida.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/0n22rbcc291jl63j64haf2g4ss/47305826412.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=class+9th+notes+science+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ab1.bin
a5fd3bc8ebe4584d74930d44bd82fd999316d60df3f4d22aed746ba14d9352a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB1 19304 bytes
font_01_sfnt_off00015de3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15DE3 16792 bytes
font_02_sfnt_off000175fa.bin
69e9bc5c5a7663972c0b16cb83d97382e8a6303b573282437ca83daeb3807880
pdf-font-stream PDF embedded font (sfnt) at offset 0x175FA 10816 bytes