Malicious PDF — malware analysis report

Static analysis result for SHA-256 3531d32adcb48882…

MALICIOUS

PDF

85.3 KB Created: 2021-07-13 04:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ede618717d47daea52b939beea48b524 SHA-1: af8c8c2095c2c37b2a2f69973d6aa230d0108390 SHA-256: 3531d32adcb48882948f17c63c80031db5008142d6b26c05a24587ab8d1c229c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicate a link farm designed to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests an intent to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a5ec94d0e3f0be41761cb16a846f2b98/nezesabigedu.pdf In PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/desozuforum.pdfIn PDF document text
    • http://axwelindia.com/uploads/17761500603.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/bgalp0e1ujpl7njphu03mgj0j1/39173021369.pdfIn PDF document text
    • http://unsersohn.ch/images/file/fafikixeravoviwexa.pdfIn PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/29645444903.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607884f83257a---nupipavifiwi.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/34699222143.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/livadodamamiramopu.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/jawuwubalebebixune.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/desomasuduxanopojen.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/sp9vpg5r7v8e6of3c1ck44o473/lilubokul.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/zupolubapemekeguduf.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/8a24e2abb38517bb54642b9d1cf8fd47/90707010904.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/wuwofosisakapax.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6e8fb55d79dee0b9c9e7dc7f9ca24733/bufujizepibevaxenokupiw.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/15889530557.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/19798219904.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/164ffafacc4dce2e02f1d6119d6d5064/85909404054.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608315ef92127---56938902107.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/bcef93c4f9d8ae139fe936cd50d1eaa0/vekuve.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/p4k2h4tvbrk3q9j6rt94iklj6v/45893900979.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099caa9b217d---xeziniwisefakukarofiliwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=two+letter+words+starting+with+lPDF 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
stream_002_off0000e91f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE91F 10576 bytes
SHA-256: 7ec9b45d92075d157410f87fecf2bcdf8cc7091f165f2aaa7ad53481148180a7
font_01_sfnt_off00010109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10109 17644 bytes
SHA-256: aae619fd81f3328bbb4bcbfa590881244bff0e09139f4e38cc192b5c6d68303c
font_02_sfnt_off00012fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1