Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da5e2074f62dd9e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-13 08:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b2471ad150965198965a81c274cbdfef SHA-1: 2e46cb5cea6cc2b4b2f74e190cbf81721a1a654c SHA-256: 3da5e2074f62dd9e1b006e45329c11c692db94871f1ef674fb38f704371bb8ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress uploads and disposable hosting. This suggests the document is designed to redirect users to malicious content or download further malware, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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 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://www.burnat-provins.ch/ck/ckfinder/userfiles/files/dulelegogawerimiro.pdf In PDF document text
    • http://studiofranzoni.eu/userfiles/files/76614788552.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/zevop.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210903232610_274231721.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d944c3f02---sowibedusudumepuwa.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/97247321210.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/99976736792.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/18597507131.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/xogufijoturevarijikas.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/43022323883.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382a9e481c8---zivurofesowugotuf.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/14623907463.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/tobeju.pdfIn PDF document text
    • http://chinalabware.ru/d/files/vodutexatafemajuk.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/79571670644.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///83429490227.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/desotafofegofe.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/fibutaxip.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aec9e79b1d---benomokovidiza.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/26590053219.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/17273263788.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb3a88732b---vifolodobuburigavu.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109020807483705.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/51333591180.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/51861787202.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/38312316676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=sunbird+life+cyclePDF 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_off0000ddf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF1 10352 bytes
SHA-256: a963f8daeda79ff19e19b485623fe8d580f6527dae6168b7d85dd7205c75fc5e
font_01_sfnt_off0000f56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D80 18744 bytes
SHA-256: 5eb2c893bb320b340da17c1a4a4dbdd180047d19910aa66affe5d130086f459d

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