Malicious PDF — malware analysis report

Static analysis result for SHA-256 b035e3ffe0f5fb4e…

MALICIOUS

PDF

96.2 KB Created: 2021-08-10 15:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2b5c5050dec22872371f04cb2447646a SHA-1: 860295182c639c813b6addc1fa688e781ad43e3a SHA-256: b035e3ffe0f5fb4e295ca652baf07084c08c619e7d961442f769bfeff65d8948
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised websites, likely intended to host phishing content or further malware. The PDF itself does not contain readable content, but the embedded URLs suggest a tactic of redirecting users to potentially malicious or compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/85438530246.pdf In PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/4781b184c64b5555679482381943a8ec/subuwadumuxigiba.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/b5s66e7dh1i2crf7fp7usikspr/60742363800.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/36726032477.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/19393519478.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c51f78c8f---90047565915.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098985e2da65---fudigebonuki.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/23604847083.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/d690c4548360c348cefcb2693cf7042f/84455845815.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210804001757.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/fesiwemewenozibidilisu.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/57610395325.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/7e527eb21a15943926a2394ba0a1507c/78540405832.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/7skfg6kmmt4badkni9mhslrub1/kogafurifofijajab.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/70299835213.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/44808889468.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/4566101041.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/21924100331.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/35881349814.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/35320205.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160715321bd574---vupobid.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33195117116.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/c0903fc9ed64d7caa721df0476dc6687/wesobevigam.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/bc25b4189ba6b49cdda0fab690ed1445/39955084598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+hack+dragon+city+cheat+enginePDF 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_off000111aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AA 17796 bytes
SHA-256: 367f4325df62b7c6793576294bd337af6cf420c5c55d20c04eb54de175abe44e
font_01_sfnt_off0001400f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15826 10716 bytes
SHA-256: 55301eb426ff858e17783c38bdf59d38d1ffe05036e00f3e6b73001f92ca0fb9

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