Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88283a6396b8ea3…

MALICIOUS

PDF

92.8 KB Created: 2021-07-23 11:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e06e833226e2318feb226893103db677 SHA-1: a89002b8f8859ac7504d7bee69c7c5ff42b173c7 SHA-256: a88283a6396b8ea33e33752507e31a905167139a4121f69235fe267a92787634
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution lure. The PRC/3D content and embedded URIs indicate attempts to exploit PDF viewers or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085c2fccbb8e---87905730090.pdf In PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/64874770859.pdfIn PDF document text
    • http://www.manorbymajor.com/userfiles/files/lowuku.pdfIn PDF document text
    • https://soechi.com/userfiles/file/giroz.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/tezinezagawenon.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210719_C94848E3BE711857.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/wixadegafoxusogenifun.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/d00e0186f5bf345b7ebdd1e7012a0df8/kokafofetugo.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9e139b318---zefiv.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16097e7f8e4900---12814063917.pdfIn PDF document text
    • https://yildizwebpaket.com/calisma2/files/uploads/73710023926.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/sukevitexoluzonumopowi.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/6887285238.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f4380f003---puvunasaxaguzip.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/bp0kb4mu9pnt2nf14a56adf95j/kisebadekoris.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89fa06860c---48204127870.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/kufikap.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/340536b4479f2ce8a71ee9e64dd25c67/81635603061.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ltjpf8pue6feo436s73jaav2h0/durofojebo.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/73366061425.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/5ec017d63e25b0cb17b1e2160fed1292/46288205535.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/a652b773b3cdaef2aa36697c610f5c52/88908546365.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/d126a11d8aa3ae7283851fb42fcab6d6/58024515798.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/26678836772.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f17bda46fe---21040685433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=dividends+and+share+repurchasesPDF 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

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_off0001068b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068B 17748 bytes
SHA-256: c86c0505cfd63929a3923addb4be5fafad43714e59f179dd939db2fd8d510dc7
font_01_sfnt_off0001359c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359C 10512 bytes
SHA-256: c359a8bfe095d183f67fe308f3a514ee75cea83e293a84daba983b6eccc6d9dc
font_02_sfnt_off00014d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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