Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b78f42e2a92a29…

MALICIOUS

PDF

71.1 KB Created: 2021-09-24 14:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 752706e81cd4d27f04513848a0475006 SHA-1: 4962a0cb9500f61f43ed680a0845d5ff4b453534 SHA-256: f7b78f42e2a92a29e5b8970d744b4bb36c023c9b676ac97b69ce9fcd7faaf3be
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing malicious links and being part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary goal appears to be directing users to external, untrusted URLs, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=coc+hack+version+download+2020 PDF link annotation
    • https://mosconi.net/userfiles/file/ditezupapatedo.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/dobonovexudotuweb.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/mesupunuposozenefe.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/pukoles.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/60983482922.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/tokavafovotidixefinab.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/dupipazuxokenokupewuda.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/76450593285.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/pujaxavezitufoguwi.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/35a1a0af1c8c6f29108b13dd3e49fc0e/lipiz.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613243d84a298---letawepigixibigularevero.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/51976500185.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/fusufesiwo.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/18367fef7495f3c7f8558c46aa3307b1/sexigadaxaro.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/77365664404.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/15823288302.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/bibojunawujufifexexof.pdfIn PDF document text
    • http://grimastone.ru/files/92754326671.pdfIn PDF document text
    • https://network-italia.it/file/siloviponugexef.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/49845064191.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/17603417426.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/fibovelikomuxozojakoruf.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f942e51b8c---xotelobonemololige.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161456baad7ce9---65573773629.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_off0000b450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB450 10884 bytes
SHA-256: 95feb5812bbe32e2f96b12913d35cf51c1c71e200990bb3000bf16842a06149c
font_01_sfnt_off0000cd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59E 16088 bytes
SHA-256: c4baf942392ebb1bd95b1c943d79d27c6c07f49fd58901a14a9d2959aa735333

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