Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5cb33b27ca0b22…

MALICIOUS

PDF

93.9 KB Created: 2021-07-26 12:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 27d2050ae62523fe3169960d023a0121 SHA-1: 7be563d0eda6055d61e4d8481643acd058922146 SHA-256: 8f5cb33b27ca0b2272c2c5d1980c78ef9be77d55e3b11bcc33b7dca61a581784
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm and an MFA/one-time-code harvesting lure. The document body is heavily obfuscated, but the presence of embedded URLs and the MFA lure suggest an attempt to trick users into providing sensitive information or downloading further malicious content. The linked URLs are hosted on compromised WordPress sites, indicating a common distribution method for phishing and malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7b7773412---mixiwof.pdf In PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/jetidaveguza.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b70b11ea0e---gejij.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/75197213372.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/627a0d0c188e2e9511dd462a3ceab8a0/29127923802.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/g23si3nq3pr6h92lhfcl7pojs6/60456597097.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/rijumeretarigajasowizopo.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/f071a16d4d2aaf194d0a89c7a012e66f/88459606689.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/62949223328.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0a765bd532b8210e55fa7e7423df8da5/nakujisugafafebubusediki.pdfIn PDF document text
    • http://starsunited.at/upload/files/nisilokojomupexubijurako.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0t65kjvj2v26kv4v1tm3m31876/tosotaxefenorirolozofuzan.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/57966e409e36a853a64807d5a2aa9e19/gurusiwamepov.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/mabugebaforalowopekuwu.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070edc1a1037---vixazivuwovoju.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/60821865177.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d9ea29747---62404841283.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160804d1129dcb---60235653010.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/58f5e3686db97d79a310595d4d6b3e94/39590969055.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/687509998.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cfed32b8185---62061176735.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/sesexufafokakufepagorik.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/be81d4715660885d22dc2b0dd68a588a/94148029070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+print+aadhar+card+without+aadhaar+numberPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C0 16160 bytes
SHA-256: 5c13cceb9d36bbc2bc20aea0fe1d16ac5c722eae827defaa6d249ccd2c25c082
font_01_sfnt_off00010a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001225a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225A 16924 bytes
SHA-256: a9be3efc0069ed8dde9f8e9451daaa30db99f943884efdfa40d0f4645c100fd0
font_03_sfnt_off00014e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E77 10884 bytes
SHA-256: f34fad80c1b0a67889ee848a09ae293143ce41c2519308657f508795e9a9c5a6

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