Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f514d56d678c21…

MALICIOUS

PDF

93.8 KB Created: 2021-07-16 03:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 928f3901e6bd6ffbcf1eff19e877b204 SHA-1: 4b85caca19361abddf60b61018604ebd5f15ecba SHA-256: 61f514d56d678c21cd29e790c9c1aa22d0d8c297ad0b5962b6e575276e243094
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external PDF files hosted on various domains, many of which appear to be compromised or disposable. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a fake browser extension or update, a common tactic for credential theft or malware delivery. While no scripts were directly extracted, the nature of the links and the lure suggest a multi-stage attack, potentially involving JavaScript for exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://neurooperations.com/ckfinder/userfiles/files/55678163902.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/24351472724.pdf
    • http://ticaproduce.com/ckfinder/userfiles/files/45217371879.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607461c1b2398---rujuvajakotepuxanesuzu.pdf
    • https://dondepodemosir.com/userfiles/file/vivikogedazabib.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609882385ebcd---gefejedakekilutunuvaxot.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5cd8781be8b53c258b5df8b47e23f9af/niririvadewivazonowilobot.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704e13342fb---88562563829.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/a586026b111426475172f8c3162618da/jaminisexodixojamibu.pdf
    • http://rainbowcaterers.in/userfiles/file/78558350349.pdf
    • http://kotolantopeni.cz/file/xenorimakozumikewitabil.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/0422a9dae81227a65793846faa615837/26014789000.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089467002ae2---fedubokekuligawakapimeko.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/6l26m1r60gq0j54hn0gbstr59f/kumatupebuniladotije.pdf
    • https://smilepaper.tw/archive/upload/files/jedoporazuwavafula.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084efabda8b8---69494293638.pdf
    • http://www.deewanalarab.com/up_imgs/37502027684.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4ad2c0ebff---37493020738.pdf
    • https://hgb.se/filer/file/safevumuso.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/vrd2m72inl67lvlfbei089q8hv/69864873554.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/p44b30pjgs67e80o2remt0e32d/vegekobagilorum.pdf
    • https://bamfieldrental.com/userfiles/file/4560505433.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cc5cc4988---25068980207.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=play+free+fire+on+website
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3ea.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 16092 bytes
font_01_sfnt_off0001092b.bin
108d0d1971c248490a21309b12d3f1788f4229784e983847165f2ecc347468ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x1092B 18192 bytes
font_02_sfnt_off0001395f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1395F 16792 bytes
font_03_sfnt_off00015176.bin
723699397391f84ee6b62267aac8694535abf1c38aee62203a4c4b7e9ac4faf8
pdf-font-stream PDF embedded font (sfnt) at offset 0x15176 10548 bytes