Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa33fe58eaa84c73…

MALICIOUS

PDF

92.5 KB Created: 2021-07-23 23:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f9d142b99e0b53c76e4bfa13f6058ff5 SHA-1: 620a19b96b905a933f563cda9105c257f132b624 SHA-256: fa33fe58eaa84c7370d8cc55c4332690874c3c4fa4b09db9417944bc72cffde7
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/be649dd617b79b3c406a09f2a73e2ed8/girodoluwegadog.pdf In PDF document text
    • http://mrpokedb.com/uploads/files/bepabaneba.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20216201557493069.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/72861323501.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607517721fca7---xilexugegado.pdfIn PDF document text
    • http://olympusflights.com/files/files/81022085005.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/javoserepubazofa.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/walutebumux.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ef51464296332624dbb4e14820a10de3/xudixiwaxolegazituzadixep.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/52284180064.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/22917475630.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/nitogejodefi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3d4ea6f1e---xiziwabuwel.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/wufut.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/rubivedu.pdfIn PDF document text
    • http://accronline.com/userfiles/file/87956262620.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/22277730212.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8ddac0d1eb0b0d25966dc554a4742267/14803671636.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/7c22eef057346a61629e2eddc3378c7d/wumuwiturerewulefuv.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/5a4008ee8ec713b454fa52b0e35e22f6/zebonabulimuvatatenuvoxa.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080d07b49ed4---lejikebiwajuxepe.pdfIn PDF document text
    • http://allycatering.com/userfiles/gujizirobusavik.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/99ad6ef03f120e0fa894264da60397b0/xebasujosufa.pdfIn PDF document text
    • http://cuiquji.net/d/files/dasakezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=qu%C3%A9+tienen+en+com%C3%BAn+todas+las+c%C3%A9lulas+eucariotasPDF 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_off000103ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103ED 17604 bytes
SHA-256: 2cec00f757104ad13495d07e3d396d6b16c0f89ad362f5ada04543c877982d5e
font_01_sfnt_off00013073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13073 10960 bytes
SHA-256: ed1489f97b2c3257994408c64e3b4296935102c73aa1e8e457cbc31da1ecdd72
font_02_sfnt_off00014964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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