Malicious PDF — malware analysis report

Static analysis result for SHA-256 902acdb67ad56aa5…

MALICIOUS

PDF

107.2 KB Created: 2021-09-04 11:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a619325dc6b51ebc35b07230b13f2ce6 SHA-1: c37ab5c34ff4945ec81b5aef27a40ee381f1eb42 SHA-256: 902acdb67ad56aa575e7ee95673d21cbfd93c5eeb7cfcc5c30877fb12612c4eb
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to websites hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL analysis point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://nfc-lampang.com/user_img/files/29337903604.pdf In PDF document text
    • http://oreade-breche.fr/userfiles/file/76891402641.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/490010263eae461f488825a4f6c9bd76/bigavixodonojakabapopuvak.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210529_45C7CAE076AF4A9A.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8e8066330---4841318669.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/92593325264.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/fodix.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6643f0f8a---35696668067.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f84f55ae35---lulim.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/duralobumenef.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/ah665vetqaq2br0qtgdcq6qed7/66233295482.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/32717252618.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/zoker.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611733a4bd26b---89741047984.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/denufibalawerezexivagivu.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210625041347_1ektmk.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/1076525810.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/miki4kf4743vbi3omf555dua64/vuxigivuzapewarike.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/bb2ff4ff2e849cb1d4d90d2fbcad7cbd/68447729346.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/0ee76de2e6d8f4456c20a7731016e142/dubafakadevas.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/hfqvh2n9ks4c30mpnp4iglnag2/36323719853.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/weporuvamivenugif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=hermeneutica+del+sujeto+pdfPDF 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_off00013896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13896 11000 bytes
SHA-256: 0b3aa53d0df39d10978be0ae9f98dd85322af01229133e7208096c83339c0e9f
font_01_sfnt_off00015206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15206 20784 bytes
SHA-256: 79fc7c8e085de7e6de2b3a5da95d09833f2611310c0b22f92a15b3ee482dc710
font_02_sfnt_off0001870e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1870E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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