Malicious PDF — malware analysis report

Static analysis result for SHA-256 647d57131174f5f7…

MALICIOUS

PDF

82.9 KB Created: 2021-09-02 11:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ad9602fe53ff4c755a182e7c25e1f805 SHA-1: c5e8fd1baa351d2506664bad3d1a35fd8feeee4c SHA-256: 647d57131174f5f7da4549a0417d5650bd991e0ff384cc0bc97af6a7804c03cd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be redirecting users to external, potentially malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=manual+transmission+wont+go+into+gear+when+off PDF link annotation
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/18481486108.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/75317855066.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/e98e4739fd7b9d7a1217a407a50638b3/romipajunopazevifamone.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/meredobibot.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/71036865526.pdfIn PDF document text
    • http://zuszdounky.cz/files/tatumumul.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608650354c289---pividazepofutaserowutirex.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/bbi2019tddudgo2dap241c6hqc/bunasugukepujudozop.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/88205213803.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/86400571784.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/4172740815.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/24u3h89irscdfu309eesf6vfs3/zitelesege.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/81666935256.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/65344447104.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/telezudejopinamopa.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215152314265189.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c7c4c77a79---fitijovirutijafameso.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/82030220577.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/k1vo4b18tachrj44e4n2bn4rrg/wofuviseteroj.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/2oh3rplqj1c9le5c69ugdb9utj/50641805441.pdfIn PDF document text
    • http://klhl.com/userfiles/file/13282533199.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/putilapaluvoro.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/15183297283.pdfIn PDF document text
    • https://memoservicesrl.it/file/mezaxefowotopekox.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/db33f4bb81c5c8dec7c9329b8be9dae0/rasefenemiduva.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_off0000de6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6B 10840 bytes
SHA-256: 9a6b8f76887d14cfd567b75f70ed37c6a288bc11e5575a5886213f7158470456
font_01_sfnt_off0000f752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF752 17804 bytes
SHA-256: dd1dd128c956962c49a025384cde2cebc5764ac0078028ac29e36f1ef1beefed
font_02_sfnt_off00012569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12569 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1