Malicious PDF — malware analysis report

Static analysis result for SHA-256 25825b35e8557cb3…

MALICIOUS

PDF

83.6 KB Created: 2021-07-06 16:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5052470e25d5d42bd881c9f772dcb926 SHA-1: 221524614b806c47ec6ec5a64749739cda6084a1 SHA-256: 25825b35e8557cb301312add0e4b09b60d439916f77f39c5f92c8b037b870ac8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

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://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/c1e0b61e3a4190f44464476edf3d3c2a/19497789798.pdf In PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/n5cv4aj4nuvu13n1bb4ohrng15/dadizarikinilik.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/4712ae3d237262ccaebd37844d03bab7/tisasifif.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210606134538447159i2a4h.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a01b1ec105f---kuzonasobu.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bfd5c5a11---78492374217.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752bde59a17---fogudijonite.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/xekaveritatenus.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/94140289551.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084b92376813---98501061313.pdfIn PDF document text
    • https://waroproject.com/file/15097886216.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/83549125766.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a7ea5436866f18c73535129408923e5c/rawaxebibidumovidet.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/newaviniruvuruleziweliti.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/foxelogavavikebufunux.pdfIn PDF document text
    • http://deauville.ru/files/file/81970691673.pdfIn PDF document text
    • https://etimes.mn/uploads/files/42565640038.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210531014837_948861732.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/dikulo.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/70824585698.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/6f8436f1ab1289fdd4b8cf37210b0f9f/44950380346.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/fozuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=consumer+science+food+and+nutritionPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/tuxodevigomeliroj.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_off0000e4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F3 10724 bytes
SHA-256: d4df9568a07694d5973af376b9255386a7d4e1b4b83dce74bbdeda32d16554a6
font_01_sfnt_off0000fd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD96 16832 bytes
SHA-256: 19955d52b048bf95ab5b20921642c96f09a0cae5f65bfa6752b1c14a4f466c7c
font_02_sfnt_off000128e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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