Malicious PDF — malware analysis report

Static analysis result for SHA-256 c692e6717669de05…

MALICIOUS

PDF

69.6 KB Created: 2021-10-07 02:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e21d85db2e376080d203fab6c05d2b5b SHA-1: 14af61a85ffade20a1ab14475e309ba757fe691d SHA-256: c692e6717669de053ea7b90c6f25c05f909861a68957f51ecc42f15a8c40572b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser or PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rcvizovice.cz/ckfinder/userfiles/files/lipazemofemujesudop.pdf In PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161526dd792b78---1720858280.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/98760939480.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/barukavelivepefaveradelu.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/7077283272.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/kezefewozutemedipam.pdfIn PDF document text
    • https://wildnaturetravel.com/File/14704906658.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/49270648066.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/93814581694.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/tozonezed.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/18813051777.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/55151970131.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/rifuzobinelolenufififa.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/5e0273a27964ac7cab6a7f81bec95e6b/tidodawopubesune.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/puroxi.pdfIn PDF document text
    • http://tantrungnghia.vn/media/ftp/file/zesum.pdfIn PDF document text
    • http://transfertrolley.cn/d/files/73460162006.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/63804508600.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/21855704949.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/51256586673.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/98145185172.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/nutetuzudadewad.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/resoseler.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615bd9741ce5a---94679975522.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/ab4b5ebbf36e100cb6da135fc9186264/39377807168.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=hiccuping+in+your+sleepPDF 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_off0000b408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB408 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1F 10492 bytes
SHA-256: 46e3fb58aedb82b9e87ff6f05c4235d7c2d8c2eaca986ee1bf81e73274fb08ef
font_02_sfnt_off0000e40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40F 14672 bytes
SHA-256: 023b5bb5c107269f18dfed4b54b83736da909365225cfe4849bc33886ad4f1cd