Malicious PDF — malware analysis report

Static analysis result for SHA-256 8225f8fb7700e6ec…

MALICIOUS

PDF

82.4 KB Created: 2021-10-08 15:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0dd40eb8eb7188eab2690cd65b328759 SHA-1: 8dc90e868a7bd893219ef7e0ad43dbdb9aada572 SHA-256: 8225f8fb7700e6ec32cb2ddcd945f0f22bc313a08758735f2deca6269f716baf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm for malicious redirection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://irlanc.ru/uplcv?utm_term=three+r%27s+of+the+new+deal PDF link annotation
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/a672129a2f0158e01db5fb84f08cab54/fawijudezudarijugowinit.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/bojusotalelorozel.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/65911511138.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/veligenalunibabodibej.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/wigifobivugifiraj.pdfIn PDF document text
    • https://aurorahoian.com/app/webroot/upload/files/83090082668.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/37004382999.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/ditolowaga.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/rafebutejapibovode.pdfIn PDF document text
    • http://bociany.sk/media/file/niwafapuxidoxemovobix.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/49593302052.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16329925198947.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210903_000845.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/gazaxakezexabalizebav.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/37462770169.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/79553985666.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/madasulup.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/46552532641.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109302210442040.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161478f4c7bf12---zufedopo.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/zowovikerilifosesejaxut.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/49033593119.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161403979abefb---sexat.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/37652703122.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_off0000dd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4A 10444 bytes
SHA-256: 68f57721b33215ca899278f6a8f1b3c1282a65f659d6651f636d72aca38c5dcc
font_01_sfnt_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D21 18020 bytes
SHA-256: 20f756992c61e8d028a314feca1aa054d0248cfbbb4cf2984c4eb35710896e23

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