Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0003740b2cf8af…

MALICIOUS

PDF

86.7 KB Created: 2021-07-23 21:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ff097a187861da9191c66d374dec953 SHA-1: 78813c5fb861d6eb55ec645734ef82d4c5d2197c SHA-256: aa0003740b2cf8af157fc263e0e75fc4ddbd36ef72d97c18e285e525f0fd01a4
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, characteristic of a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://vinhomeshaiphong.net/app/webroot/img/files/40492364175.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/xibiwezaj.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089f4860a386---relisewixanikigeje.pdf
    • http://jeyadhurgatemple.com/userfiles/file/webixe.pdf
    • https://csn-alliance.com/data/files/gebimefobifiminesu.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/jmo4tq49kc6ierli9d7l3kn3i4/begonejisakojo.pdf
    • https://flour.co.uk/ckfinder/userfiles/files/92281761973.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/4c00596f95d021c14c7679adea8e3509/biwiwep.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160829e0f71ca2---43603699526.pdf
    • http://tsradviseurs.nl/mailing/images/photo/file/43607764856.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/7jdk0u06llc3sbp7mgnjqr37fb/talabajona.pdf
    • http://jiuxingchaoshi.com/uploads/file/07144640670.pdf
    • http://esthebel.de/userfiles/file/gegovegimitidibibob.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a04f3cc8a54---23356760831.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/bdf81149005c00fe6e466991827660a8/lekakawik.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609199ce68789---88521650480.pdf
    • http://nano-vip.com/ckfinder/userfiles/files/zevikenizadodukeluvuvixi.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a62a94be723---jolowumudowizewenekaw.pdf
    • https://eseninternational.com/uploads/files/liwukijisataveda.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e87f52351---55695520505.pdf
    • https://binhvi.com/upload/files/41475618523.pdf
    • http://shmgec.com/Uploadfiles/files/86917512059.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84d418be51---41552380112.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609654199f7dd---46573758147.pdf
    • https://ph2020.org/ckfinder/userfiles/files/57141987042.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cbc9865b3---35030904495.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=which+is+the+best+battle+royale+game+for+android
    • 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_off0000f14a.bin
fdcac4ba17ff80d68092e59885bf16e31ab633228211ec141b7117849f566847
pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 11172 bytes
font_01_sfnt_off00010b10.bin
8559214e98d2379bddd3f3ebebf4672b2010aafaba3b01dc5ab4676d9e49127b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B10 16132 bytes
font_02_sfnt_off000134c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134C7 16792 bytes