Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cecb357ae902d26…

MALICIOUS

PDF

84.7 KB Created: 2021-09-05 13:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b75ae8edaaa867e067492fe8a91004f2 SHA-1: 72396329f22091ba852421f2b619e977a459c199 SHA-256: 9cecb357ae902d264689e8803788b9a5bc5f46b2a5efbcba69a18af024df3a57
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common attack pattern of redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://smidgel.ru/uplcv?utm_term=sample+essay+about+myself+pdf PDF link annotation
    • http://rana-international.com/userfiles/files/tuwuvopumusaziwiwavupojop.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079844236a4c---xatefurulawixapamep.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/zagitumomobaxobefal.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/1408176101.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a4e194d23---97652787206.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c476fc4fbb8---38103216042.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/86720600260.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/wewamojikiteramorelafef.pdfIn PDF document text
    • http://sushi-belovo.ru/files/60609161051.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/nabubuziw.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c160f2bcbe1---16253138342.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098b816d5b13---rasuxakavifebogata.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/19265107527.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/6cc234537a3fbe797ebf5d8aa4dce3e5/31128672743.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/gulavivipixojifafupu.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/fudoguba.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/nanetejavugufepaj.pdfIn PDF document text
    • https://12shio3.com/contents//files/65751422883.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/70565991781.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161207d6a4afb6---70688612217.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/lidiparizoga.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/be5ebcbeb19ce6a6b2a76f7379321953/fejivobawifujunebibesoge.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/bared.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_off0000e64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64C 10792 bytes
SHA-256: c70c19923ea102b5b7423b7752b4eb4ece6ee6cf8de1a1b49615ef2ebc6bbd7c
font_01_sfnt_off0000fefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 17796 bytes
SHA-256: 8481bf2b72abce824695a8474b727849aca174cc8d6078ea3e81942bd1391233
font_02_sfnt_off00012cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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