Malicious PDF — malware analysis report

Static analysis result for SHA-256 8067bd1cc2eca5c7…

MALICIOUS

PDF

84.0 KB Created: 2021-09-17 21:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dfef6ed4221438e312ce07ab51b80322 SHA-1: 5a771a7c1069bf7d64a96be470fa1099f37cfbcf SHA-256: 8067bd1cc2eca5c7645a1eb30fc62fbbb44657f07e32093c647cbfb2cf5a3db9
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of multiple PDF-specific heuristics related to URI and link farms reinforces this assessment.

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://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/taridalubekero.pdf In PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/nubafigiwuse.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/67007760271.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/a68fa9329d51f93df0294ad521722cad/78056841348.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/zeruro.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/66463868106.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/83274495730.pdfIn PDF document text
    • http://baove247.org/upload/files/zuliwerof.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/vubuwex.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/96537880360.pdfIn PDF document text
    • http://boki.hu/editor_up/mobokokivupituleti.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/lifewofewefot.pdfIn PDF document text
    • http://shesob.com/file/files/bituvekojojetepod.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/zixorefibazit.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/tadepipi.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/70560492369.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/40379938547.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/66593667339.pdfIn PDF document text
    • http://minipit.com/data/files/vorelafetulemanim.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161352c9d8bdd0---falenibawifi.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/dimuni.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/8204342548.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/danaveto.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/kiwunadimifeviba.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f1a52b95a0c7a436362a21f564fe4f32/18693282867.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/rurejemufimavemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=p46+pro+smartphone+specsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FE 10748 bytes
SHA-256: 6e7c6b024dfe8505b258bf793b7ccbd5403d170d4d092f78b45985b670521cdf
font_01_sfnt_off0000fa9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9B 18144 bytes
SHA-256: fd5b8fd1d356b1db755638c7673b51569b11b74b6b338c1c0635c7026e288c70
font_02_sfnt_off00012a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1