Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a70cfae3cf71ac…

MALICIOUS

PDF

177.8 KB Created: 2021-06-14 10:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f5e991cfefafc89318ec9e6b96a8496f SHA-1: 16158906765c9dc52015c71144cf85f4b99d9a9b SHA-256: 58a70cfae3cf71acc65338ddc0adab027e3569c9958a9eae982f7dc1db43f280
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malware. The embedded URLs and the nature of the heuristics indicate a phishing or malware distribution scheme, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • 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://huntic.ru/uplcv?utm_term=chak+de+india+full+movie+free+download+for+mobile PDF link annotation
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607adf358f1fb---mowebepezajurajawolefu.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/rovalejakupubowubikenilux.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/7n2hg4l5s90un7ejg1tvt8ckm7/mawikogapefafofomiwowe.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fdl65l60u4ai4k27an8pa7cdh7/41723632312.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcf9777fcd---nabipuzevatuvedafobodizom.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/guxugo.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/82549627651.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/28013855427.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/kebufotirolelolekezud.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/48064105053.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c016b928---11066387801.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076993c80132---motipanako.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/xavufawenojarebigan.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/43d1296fb2d331d3813e598ceaa69fad/78755507090.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160992707ea437---saniwanefodolegekebe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081212c2ec63---30516160337.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off00020d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20D59 27712 bytes
SHA-256: 5d6c1751803ce0508fe6096d27bd2d7e8c32a9f690add137a8c0885f43f14572
font_01_sfnt_off00026485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26485 5232 bytes
SHA-256: da44ed8265df541e887340bf3ba92c075792b591edd28c04766e8578503326da
font_02_sfnt_off00027637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27637 13232 bytes
SHA-256: 44bc6913a83fbea93b7be262df6e152fcf7e843584b5950bad81b05088cd80cf
font_03_sfnt_off0002a282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A282 16264 bytes
SHA-256: a93e224a22df52af14a4237be674666aa638fdc85b9c104f58100864fb00a70a

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