Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67055018837c774…

MALICIOUS

PDF

81.8 KB Created: 2021-08-14 08:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b210c4a359420c7e470728b4a901b5d9 SHA-1: 99628545f64605ebdf02362ecf82093b748e2b29 SHA-256: a67055018837c774ecb63b2f3a0f6088519608b4467d2befe9fc434f455b5b40
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure and callback phishing pretext further indicates an attempt to trick users into downloading or interacting with malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ketchas.ru/uplcv?utm_term=fb+lite+updated+version+free+download PDF link annotation
    • http://aj-logistics.com/stock/userfiles/file/jarovonanexiwapolis.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/9c3c7878d4ca325b0de1d98940e0fa9a/gosof.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/3m0dqccb6rhmg3p271fo1f2t01/86469593675.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/d015b571dca6ce92b3e6d7923bd9144a/gikudajabubufimumokegipe.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/nimijozetoso.pdfIn PDF document text
    • http://ibb-online.ru/f/file/toratukuvipurazojetewitiw.pdfIn PDF document text
    • http://trivio.it/userfiles/files/53556494962.pdfIn PDF document text
    • http://asustainable.com/global/file/zododexosazitifesoxujo.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/b82eqeiimbcsandh74haavk0ah/fogode.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/10372855663.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/wupoxujutibosave.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/semeb.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb3a82ff93---56655854556.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091fdef2acc0---17609513580.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946f8a355ce---muzovedeluga.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/sunuvetes.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/tetaw.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/tosabizobagowevixojuguluf.pdfIn PDF document text
    • http://daycamhoa.net/upload/UploadFiles/files/zimanisoxinavexabiz.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/degujarisudikasux.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/2nvr83gdie2en86aqdgrvv9oqj/luvatoz.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/2ko6beg3dvjuu9u98lnc92k5ve/kezek.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/luhj8e78cp3lponpj2667asql1/24057170788.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA60 10860 bytes
SHA-256: 0cb4f128c4dda088e4f3b60da65c61793a7527cd90b414ca4dfa7545afe2ee26
font_01_sfnt_off0000f36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B81 17236 bytes
SHA-256: ee23a41c2e19bcb5818291c2a3116e61a19a1ac83d3e103d46b5652101ee1c11

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