Malicious PDF — malware analysis report

Static analysis result for SHA-256 160c7250cef83c4e…

MALICIOUS

PDF

86.3 KB Created: 2021-08-14 16:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5e506436000e78aa0a90b1741b3a43a2 SHA-1: f139add33b109fbea1f634875d4ecefaba5de918 SHA-256: 160c7250cef83c4eef3d32c84f80d6d21873181fc5a8f07c1f2a806b1679343f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a credential harvesting lure. The heuristic 'SE_MFA_LURE' indicates the document likely prompts the user for a one-time code or MFA confirmation, consistent with phishing kits designed to steal session tokens. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest an attempt to distribute the phishing content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://chp-travel.ir/data/file/45094313524.pdf In PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/53506465542.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eddfbdd573---54102675238.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/a4bdea600d47928163f3c10c3c4176b1/bebesupajuza.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e012e95702a---87423957631.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/guredezevogudag.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/35957165693.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/butusifojasid.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16265160755941.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b083c1b2221---benanazepiduxudodizawupi.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1628945450.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/didelevimukixuxulabado.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/90328358536.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/jto2ha1svo7eq3bc0t247cdvp1/68322494688.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/rupozutanijarulifosunafe.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///buvomimaxadimixonexesa.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/23104529931.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacf3ea188---33564625477.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/59031197257.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c26b8fc8b---12847712465.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9ca73f573---turiduzotivogagubefiri.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mesovunujibovavutosesim.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbd5f4c228---fazakesaninikub.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/nm79rjmcnuiu1en7f9nn9vdm0e/1861541850.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/kekiwoxe.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/31698404759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=why+is+my+brother+printer+not+connectingPDF 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_off0000edc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 16976 bytes
SHA-256: 4d28fbb8fcd08c553ed98734a367114a3ab3d951317d8b5c928c318f3fee65f9
font_01_sfnt_off00011a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5C 10860 bytes
SHA-256: 75e44f23464a449bd4220d5452e52bd63c17fc5592ea1ecc3338a62a93288440
font_02_sfnt_off00013311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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