Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb43d17c0cc5bd4…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 09:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ae26928b6407e67424ec22fab0745a8f SHA-1: e0799722f077314842bb4f28b87f6ffd68034c67 SHA-256: abb43d17c0cc5bd4672600fc2986ca65922eae873fc63be3b89d8fe1d5586937
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to link farms hosted on disposable or compromised domains, suggesting an attempt to redirect users to malicious content. The presence of these link farms and the overall structure strongly suggest a phishing or malware distribution scheme.

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://megashina24.ru/files/files/dafesibumibubadivob.pdf In PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314e6938c17---minezoverubegiletilikawe.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/91309309593.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/jinif.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c967027ccd---betasuwupabezu.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mowilowizezivedinu.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/pufudediwubev.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/sizapipipoxag.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/59117793834.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/14519212917.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/kimofazufuzanus.pdfIn PDF document text
    • http://arsvet.ru/img/upload/18798219228.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/guguzerevijelasudozifepud.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/1820950523.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/93976773396.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457ed976bd5---wuganexixen.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/movobefuvuzajodana.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161359ad056741---jesibolubebalotag.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/b0a8f6ec86800fde7423e4f72da9b2b7/34142216240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=download+apk+mod+higgs+domino+versi+1.64PDF 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_off0000adff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADFF 16248 bytes
SHA-256: 22200ac229452b5542a6205a83996c2d3fe07ec7f208d8be7e722d93f84a65a1
font_01_sfnt_off0000d760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF77 11348 bytes
SHA-256: c64ef49110ccffad04e5fca4b2ac1e349d46f7f415139257f05f111ac05f6113