Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea57d181286fad6…

MALICIOUS

PDF

86.5 KB Created: 2021-06-26 15:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00fa4154f590352447934a978bf45452 SHA-1: 559784cbb1de889bb4f237e5262bc35909283a08 SHA-256: 5ea57d181286fad6d9ce8b94ad0e613de7a76ae81d6ed506f9bde2bd97d7ef98
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and heuristic firings point towards a malicious PDF designed to exploit user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/9dfc75cfa07d4e2340fc787db90b2fad/pavusor.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3a70e9ebd---86930302026.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/fd2d567c623973ea25ad02e4894b73e1/xarojera.pdf
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/bevopamibufivimutateji.pdf
    • http://tizianaiberti.it/userfiles/files/21246167050.pdf
    • http://pokemom2.com/uploads/files/86899553006.pdf
    • http://skiflogistics.ru/userfiles/file/kudasoguwefisob.pdf
    • http://hnc2.com/userfiles/file/nogaj.pdf
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/lusovebo.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/b8ckq1nggs8sp7bu9atju1lvg7/48391876029.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/k2blt7mv4obtto09ua5etodgb0/favugegafonetemiwumimujud.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/j9rv121j87pct02r3isa3lo0m6/tidinedufosemowudepoj.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/3acbba89459836d9ac608a66741e0db1/nimeruxokod.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/09b8c89feae28783d6d3240e9b646db1/19005601854.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8433a5c112---68183540899.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e56ed0912---rasut.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4536d70671---ginugatur.pdf
    • https://lepjunk12.hu/uploads/files/14893841785.pdf
    • http://oreade-breche.fr/userfiles/file/difikutomisamevojefak.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb91ba8e54---70375041520.pdf
    • http://naturallabs.de/userfiles/file/99832550468.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/6a99cac1cf669350d354659021080714/75948639869.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=10+scientist+names+and+their+inventions
    • 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_off0000eccc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECCC 16792 bytes
font_01_sfnt_off000104e3.bin
f203ebfc81946453083f55c922cd73b0a4e2e93a3ee8668fad310371ece6d6f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x104E3 10732 bytes
font_02_sfnt_off00011d64.bin
d22f424f212c43949054b04c7787d9ce2124dfd5d6a73789bfc32e35f47a77e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D64 18376 bytes