Malicious PDF — malware analysis report

Static analysis result for SHA-256 c46f1ab90b984194…

MALICIOUS

PDF

79.6 KB Created: 2021-09-16 10:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c9caa23a7719cce883b47c9debc7926d SHA-1: e3a8603dc2a5d54336c515eb59cc2a73c8397aef SHA-256: c46f1ab90b984194e67addaf6c740a7eb3ec56d2301b549d5465be00f85863f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that redirect to external sites, some hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially harmful content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://chcial.ru/uplcv?utm_term=how+to+record+the+mobile+screen PDF link annotation
    • http://fructusartis.com/i/File/64694142919.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/fipogadubalidofetas.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/1230007060.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/9821650426.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/rowomemunewogedu.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/ralajifesinedomi.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/moxijafudufeme.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109090310239222.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/jotobidakixi.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/lozivaxexivisofanodek.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/sikatokiwik.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/56543486774.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/68261185764.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3a4240be3---76410794483.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/65213748775.pdfIn PDF document text
    • https://aneri12.eu/res/file/93655915279.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/gapusifasumazokudoworik.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f94eeb5b00---sekil.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/41357119495.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613713b06dc57---sidefaregodux.pdfIn PDF document text
    • https://aashianarealty.com/file/wesuxedesogagonax.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/80703521778.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/98571981335.pdfIn PDF document text
    • 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_off0000d393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA5 17592 bytes
SHA-256: 2ea1aaf8c5bec9e404758b0dddc320bb1194b7d39550d46a9fcd1b3a0f052887
font_02_sfnt_off00011932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11932 10688 bytes
SHA-256: ae6b37274b9c856c1b3bc82da5798b6784d4c6f5e9afb871a2f89e04e97f3827