Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f976d4e35f7b83d…

MALICIOUS

PDF

75.6 KB Created: 2021-09-12 14:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 60d83ff0a57c0dc216b2220a21b0848a SHA-1: 2844d7ea64e3e8ef88298140f0c1e2dc050bcf72 SHA-256: 7f976d4e35f7b83dcc7a0445c73d916d2dd8a2b6ba5e980f992d2e79a71809f0
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1555 Credentials from Password Stores

This PDF document exhibits multiple indicators of malicious activity, including a high ML classifier score and ClamAV detection as a phishing trojan. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document directly requests sensitive recovery secrets or private keys from the user. The presence of numerous external URIs, many pointing to compromised CMS upload storage or disposable hosting, suggests a phishing or credential harvesting campaign. No scripts were extracted, but the document's structure and lures strongly suggest an attempt to trick users into divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://archism.ru/uplcv?utm_term=handwriting+to+pdf PDF link annotation
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdd179660c---dumutases.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/wozeru.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/8503107428.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/zegiwunarofamod.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/6hups4dfv0fhuhigqpkflnhk29/kidajodajabidogomeve.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/12974457072.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210912085348.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/xosomozobojimeturakit.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/64341733793.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/fasopigudenofixewazafufe.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/rizazotatojokalopepobo.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/pojupebetaridoxijeketu.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1612eae49e99a7---pabasoraribovuwudi.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/78206560495.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/81323264374.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b8c643711---776462373.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/tiwif.pdfPDF link annotation
    • http://adimhukuk.com/resimler/files/renisedufogotamemomavex.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/tuxoresegitoxub.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/23513532204.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/kijaturevokosisomoja.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/zivakinotilemovulekam.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130811578ac8---45926973157.pdfIn PDF document text
    • https://retta-bg.com/userfiles/93556493427.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_off0000c337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC337 17756 bytes
SHA-256: c8b0f07ac5c2072ff4ee331c725190c0d924c0921bc1c4f70136a31716a254c6
font_01_sfnt_off0000f1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 10404 bytes
SHA-256: b292606bfbc5dea68e6ce39dd9aaae10a78dfc9a0f51d95c46c23157d8497624
font_02_sfnt_off00010952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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