Malicious PDF — malware analysis report

Static analysis result for SHA-256 785c55358b831375…

MALICIOUS

PDF

93.8 KB Created: 2021-06-28 01:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c17849796abf5a94c478040225509b78 SHA-1: b7e9358502e520da84383f59754678031cbb62bc SHA-256: 785c55358b831375d65dcead9eb033341a978f6f8d757824f81562493bf2cc5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links pointing to compromised WordPress sites and disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns or serving as a lure for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://philabc.ru/uplcv?utm_term=health+quizzes+and+answers PDF link annotation
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893eef99308---kelos.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/a7fd94ff22524b3e0de5be5a10710a06/58330431643.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/88267390210.pdfIn PDF document text
    • http://nfc.soo.jp/file/lavumobodipaf.pdfIn PDF document text
    • http://belloverde.net/emailer/file/51123333689.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d06164aff7---90695099414.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/58173630217.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/2d0ae282434c5b135676989cc658b1cf.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3fd849dad---47356218422.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2130a1354---19537513688.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/q7id4lr6kt0hgoo2r8tevvgbst/30606863590.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608155bb2b960---guripipewazufefurezubowe.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076056608949---84428753789.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/beb5866ad67773525efe6a7fc5919dd9/zoxunizixerifekonopuzenaz.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/59904555978.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/titaxawanise.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cf517c78d---fuzadobinig.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f5c842a7b---xawiko.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/4c73e10616ce212f0d567331a1a30db6/remobanarokesuvixup.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/v2p5q248rl9117r098ggj65e2t/pefetevawazabesi.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/ac2110e3f632792d6877af2edb2a137a/88673107066.pdfIn PDF document text
    • http://stratford1980.com/clients/1/19/19838be1bbe5684469623718d5e25b5d/File/64289823451.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e8c66da1a---23630272048.pdfIn PDF document text
    • http://usmleworkout.com/files/file/4982887780.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF8 10608 bytes
SHA-256: 59b7437ab16d3671ea1d0317a6bcb854bde0eb175953a588d25b9497ed17b602
font_01_sfnt_off000122f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F4 17904 bytes
SHA-256: 0eae4139b17b9cec1897528069c05efec5959ef9bac7f76211d439bef50f1783
font_02_sfnt_off00015227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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