Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75f24beb4e5f0a0…

MALICIOUS

PDF

71.6 KB Created: 2021-09-20 06:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7d9cfe7c9d39412607f4ba08ced3805e SHA-1: 151f272c5a14761c13865f4d59da043b3fac69b9 SHA-256: b75f24beb4e5f0a05ba972ca06304c7d995d6ccee444addcafb8bb82e3bb077c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bandotrading.it/uploads/file/dafuxogajav.pdf In PDF document text
    • http://extintoresorigen.com/images/editor/49089649780.pdfIn PDF document text
    • http://sjanzee.nl/file/19971652766.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/65571371048.pdfIn PDF document text
    • https://izometal.net/mm/file/55986992330.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/14636760378.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138305182306---vakugo.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/76711689007.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/fefijojirodupukodumofaf.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/77727890688.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/42809008573.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/f2jfbqkou1fqjecnrcb6atqurd/6115726241.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/82438400710.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/4449785154.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/poxevalexigakuxeju.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/sezafotazojidarolinokor.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/bulonetopotajejijib.pdfIn PDF document text
    • http://hk-keber.de/images/file/porisajomakiwegufetuj.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abb0d946a8---regozera.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8c04dc82d6a7ce57470663cc01cc6d03/58585946557.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d887a193e8---96127877772.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16142b5606d6c1---11751932782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+fate+of+the+furious+full+movie+gomoviesPDF 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_off0000b462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB462 16936 bytes
SHA-256: 922fd7d93ce8f9d4acae249ecfa27f0b4e4d5f31455d70edb6925c5e74ba584e
font_01_sfnt_off0000e06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 10684 bytes
SHA-256: bb28561c0e0b4e3e1ca68bd24213a4abd1e7555ebb0e78f37926cb6fa4ddc87a

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