Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6e312fa039f781…

MALICIOUS

PDF

74.6 KB Created: 2021-08-21 07:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 37fc2e2c80a4e6970d8b105abb14d1c5 SHA-1: 1ba66890b7d7ff0f12539b119de33b4e3b640676 SHA-256: 5f6e312fa039f781989f5efc637ef8f96bdd82b74b360e062803fce383d888e4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, likely to distribute further malware. The document body is unreadable, but the heuristics strongly suggest a malicious intent to lure users to external, compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://thegioimaychaybo.com/app/webroot/uploads/files/sarupijexixoxap.pdf In PDF document text
    • http://modellszerviz.hu/userfiles/file/vuzutujixodawugaz.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cba5d659d5---70674345132.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161115c293bb80---gobevagad.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/35336875446.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/nuvaw.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609adf5edfcfb---buzesi.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/lelasovegavewoxuwamok.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/86063740662.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/pikomedowipetifitaxadolib.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/xuzixusotezodakuzibugufa.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/cd6ea774c943fdfc92c416f20da4220b/73664676578.pdfIn PDF document text
    • http://usmleworkout.com/files/file/28277449098.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9a593b481---79352684742.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/vejivigunefuj.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/89120552812.pdfIn PDF document text
    • http://1carl.com/userfiles/file/nujafalipomere.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/b1815bad2d4dd53b33acb12c8a4159db/55095438239.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/nurox.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92137191851.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/veir5kjcnck3hdvb307h2at8vp/kejubezojuxovi.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/maxipuxegizubuvuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=concierto+de+aranjuez+partitura+pianoPDF 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_off0000bf8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79E 16784 bytes
SHA-256: 908ecab957c4d3c3cf91051fa2417bacab9b8394daf1007418a3bfa58d7814af
font_02_sfnt_off000101b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B6 10616 bytes
SHA-256: 31c3184e6d9ee0e5d157e948554c73681948fcaa830a977f8fff1b7d778cb7fd

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