Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3f01e9bdde1c5c…

MALICIOUS

PDF

88.8 KB Created: 2021-06-29 07:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6976599f15fd65e8ea7fc72ddf8d942d SHA-1: d7e04784f2746a90a0e97e1e27429a3f80f83096 SHA-256: fb3f01e9bdde1c5ca6df3966975cc513468e9d817e1cb30d5dde08553e503074
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs pointing to compromised WordPress sites and disposable domains, as indicated by heuristics like PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://thegioibaobicarton.com/Images_upload/files/bilogoxajujepetelapil.pdf
    • https://allmassage.net/upload/file/20210509054925.pdf
    • http://gramercygrand.ru/files/file/xegefuro.pdf
    • https://stopserv.ru/files/file/gisogopakulubebuxore.pdf
    • https://olympicwroclaw.pl/zdjecia/fck/file/bibefuxim.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eh4cpk7o7m9l65j2n0ffrcfp22/zegas.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/99951367250.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089af85a84be---gowilekajerimozo.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8f44469ac---22407473888.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9b7069b2b---gelaluw.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa64c974b---jabogiv.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/d830adf1b61e45085b52e8135061be82/31447167881.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/330e16086470c3e73b3111b0c0b979ee/kekujogositibob.pdf
    • http://apvn.info/userfiles/file/voluritopuzomefaguwutavo.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/154ba013a28401096f3091f021fe2b6b/13268600999.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608132abe78db---baxejowefulewafapununupa.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/a9643df531a20abb55791c42d1f2b7a4/33650637399.pdf
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/musejugizibibokimegukokug.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607615fad5356---logumafaxojekitutan.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/21f472c1175b2e65c7c6511508f01c9b/fosalaxomuki.pdf
    • http://fogathajtohirek.hu/fckfiles/file/26821464297.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607392ce7a1aa---71460950145.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=smoked+baked+beans
    • 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_off0000f7b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B8 16792 bytes
font_01_sfnt_off00010fca.bin
e8943609e92c6a3e003cd349af92070b3de518d44a44128cc305cb40b2c2c134
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCA 17980 bytes
font_02_sfnt_off00013f16.bin
b19c77e127cb72471fba06cc5947adf19aacd7acd5900b743f05e41d80d1f17b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F16 10380 bytes