Malicious PDF — malware analysis report

Static analysis result for SHA-256 f284f467b22c6700…

MALICIOUS

PDF

95.5 KB Created: 2021-09-01 08:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6962aa4033482dcc4aab015636564ead SHA-1: 5c5ea7042aeb06307907430fe55cc6f6486a5657 SHA-256: f284f467b22c67009aff9d5ff148ea8188b5327b3b05e5334f03b2262bfb2a79
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8353c5d74---lovagoja.pdf
    • http://katachizu.com/img/news/files/24284811358.pdf
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/tosafidatenunerez.pdf
    • http://sloplast.com/userfiles/files/gurewimogeduzitefego.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610417b0b9dc1---49440373696.pdf
    • http://mhs69indians.com/clients/864804/File/kifovevotipum.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00c2ac9191---kizakisagevumofo.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ou317nrguhj55pt7mt2r0m0q46/35020455543.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d777be5e33---gelovujidimiduxotupebovi.pdf
    • http://mojahotels.com/ckfinder/userfiles/files/kawaburovoxotobudilel.pdf
    • https://santchavarabed.in/ckfinder/userfiles/files/12314877709.pdf
    • https://sahyadrisevasanstha.in/userfiles/file/19502873689.pdf
    • http://uzmansporzeminkaplama.com/resimler/files/gexorefigokigekuzubo.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/20c6e526e1ea0f15aa13a850c3597ae4/63387312635.pdf
    • http://africareview.in/userfiles/file/69249984814.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/cc58ae29c4378372f4f3fc9a20f4814a/91658403559.pdf
    • http://lsphc.com/userfiles/file///zujuv.pdf
    • http://stroi-sistema.ru/img/72317561430.pdf
    • http://jinistudy.com/_UploadFile/Images/file/zowosoxuwugebolisu.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072dcb703730---tikezizazexewofinide.pdf
    • http://fioredda.com/userfiles/files/84024530094.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/uusntg9a88ole49m8pqqtvhega/zivinoseniwixipalezale.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=i+only+had+a+fever+for+one+day
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114ba.bin
72efa949c1df0eaac1df042c3c47412b54cdc8209b4a4627d03ee17c84017eb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114BA 10224 bytes
font_01_sfnt_off00012b98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B98 16792 bytes
font_02_sfnt_off000143aa.bin
452e2b1c3b5451c4201ab850ffd2eff20d7fec780eded5a92f066f48f4667722
pdf-font-stream PDF embedded font (sfnt) at offset 0x143AA 17556 bytes