Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97fd4ba18fdf054…

MALICIOUS

PDF

81.5 KB Created: 2021-09-02 08:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1cccb4fc89099687fd31879d5da3e81f SHA-1: 25ebed23b03bb36bd5dcd511166a9c559fd546fd SHA-256: e97fd4ba18fdf054f3edd85dcf580bbd7def04c7c5b863cda8ef6f5d81aca5dc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to potentially compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users. The PDF_RANDOM_URL_LINK heuristic indicates a link to an algorithmically generated URL, further supporting a malicious intent to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://catamma.ru/uplcv?utm_term=anemia+causes+and+treatment PDF link annotation
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/upb4q1dt7cd1srgpra5msis8da/73435388487.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/xofisubemi.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/be2a45a3deaae660540d6a5c8bf93943/40980426068.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4a4b5bae8---1269468612.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/43292469634.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/75261546209.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/36809728246.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/juvubirekefuverolusizeg.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/r1ftmb633ar5a2f89b236hbbtr/70175047207.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/finoj.pdfIn PDF document text
    • http://sapaethnic.com/webroot/img/files/65431323446.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/48491502465.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/fetogonufofifuk.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/38094823063.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/xuxopofifexa.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91931356891.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/fisotis.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710cb166b76---84783179283.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/65165184675.pdfIn PDF document text
    • https://bloc-immo.com/images/xomafetefopavowagufurano.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/vn1lh5gqav217r4gelqmqjc7ss/442627049.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c038b7a592a---kezenimososizibimubiw.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_off0000db4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 10448 bytes
SHA-256: 522ae3787568a97b0341b8e23fb02d50925835b64ff17e9854117a4600b94d60
font_02_sfnt_off00010b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B13 17240 bytes
SHA-256: 1bc2a2655743846bfd36ae7d80ea545964896978a97929d1ea18f7bf8a999977

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