Malicious PDF — malware analysis report

Static analysis result for SHA-256 a947d5c615bdc29c…

MALICIOUS

PDF

76.3 KB Created: 2021-09-08 00:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f2ffb8fbc2514ef6c5f21212d2f59d70 SHA-1: 712d32eb1db4314aed84cac9b87815e1a39c31d5 SHA-256: a947d5c615bdc29c358d4cfc801611a2c2bbd5c82464528ae8a7916278a4830e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to various compromised websites and disposable hosting, likely intended to redirect users to malicious content. The PDF structure and embedded links suggest an attempt to disguise malicious URLs as legitimate documents, a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://synerhu.ru/uplcv?utm_term=ptc+windchill+manual+pdf PDF link annotation
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/siuugocumddne5jhpfujchf7bi/xobutuwuponokalibomefiba.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/80582031018.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085eb0d0a154---xiwifazuliwitapo.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c3b35d233a581611c954f782af009c11/kagisolinemukuzoguxe.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/topogovitiwoguvekemibix.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/84533463788.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/zatimililigibojodo.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/dok34r2k56oerihq3591mena42/nemodofipaxejudesemumojak.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079eb57467b9---33178907301.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/gasexiwud.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/d9prbr9n17ttovn4s368s8loar/84410932703.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/milido.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e45c8483d98---zejif.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610de5f53501d---81982263621.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8bf09da79---64036899456.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/gijavutupoge.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/62764714371.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60e1200ba1eeb.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/6dd98255ff57de5b767abcd786bc3f96/newizinuropil.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/3485a328894da8be371e90c2d4f3b55b/52599024774.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce50cb4fb2---99365587200.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/vg9loums6v798lc02nthskuhd5/wikaxudogabijuwexi.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/joxamupot.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/82620009322.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/vuxikibijeferozusas.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8014d14bf8---37231613764.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/pusomerewewogutimosarebov.pdfIn PDF document text
    • 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_off0000c8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D3 16596 bytes
SHA-256: a60107f94fe08c2e8ec1a1455ce556423f0809710571cb0541dfbf30074a5e3d
font_01_sfnt_off0000f3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC2 10552 bytes
SHA-256: 7012d1d61c46e030a5a2b1ec4eeaff40bfeeecdba3b2c62f04efee4e04928963

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