Malicious PDF — malware analysis report

Static analysis result for SHA-256 79cc3071fbf0c4db…

MALICIOUS

PDF

86.9 KB Created: 2021-07-02 06:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b485f2b7d3db1d18c48409e694f8979 SHA-1: b66f68d9951e54cd240cb06d58762eda6579b228 SHA-256: 79cc3071fbf0c4dbdb130d004beae3d8a6d2ccbd86645c8135fa290488f3ba9b
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other potentially malicious domains. These links are likely intended to lure users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5827cea61---suwelusasedok.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2e6f7b1d68fecb5a75522511a6d46fea/suzovurigerodalujivud.pdf
    • http://nhuaduongnhapkhauaz.org/upload/files/levojegifugigaxenunexar.pdf
    • https://langumeistras.lt/i/File/mugogukorujawigenud.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf87fc21838---gozofipamopi.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/icm6quc1uvqi2rioeiu4qohkvt/34993124098.pdf
    • http://ever-pioneer.com/upload/files/mixegupilovelejotililorav.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab21987c424---53666559516.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/77868893981.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9bef85922---37701465794.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/7591cceb7a0b1bc7d211dbb3730faa9f/pogonolezejoze.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9e1a33426---gavebawabamejuber.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16093f4a4421d2---rarevamediralarexituder.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/d32d260d5d39157f1fba56b24c12dfb6/zikagotawenizebi.pdf
    • http://uralinteh.com/uploads/files/makitulijixob.pdf
    • http://booklandbooks.com/userfiles/file/6806406835.pdf
    • http://progfin.pl/userfiles/file/nadetarubadevedeje.pdf
    • http://tovicetour.com/FileData/ckfinder/files/20210613_C6B9CC60F5DC377B.pdf
    • http://meta-min.com/files/49532640618.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/m5e1u6l6feodcl4p5s77d2cri7/86975708430.pdf
    • https://nasroglobal.com/userfiles/file/dilerivunojufifanarono.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/rf71ddvd32v8a4vm3q957lr9or/61300853457.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3945a03a4b---16383303128.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45f0f773d6---jipivup.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=design+and+thinking
    • 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_off0000f3a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 16792 bytes
font_01_sfnt_off00010bb8.bin
656ef655b4e81286ee82bf8b6f0565352877cd26491ae5b43c724e775877abcc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB8 10352 bytes
font_02_sfnt_off000122e1.bin
16483bf5edefc4d3dc023d5fc5d3df319db00ce460b5a22b12b5719df7751586
pdf-font-stream PDF embedded font (sfnt) at offset 0x122E1 16744 bytes