Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d8c4d2dbf5f8c0…

MALICIOUS

PDF

70.7 KB Created: 2021-07-07 06:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 88448907ca10b6417f9f08a7cd82b78f SHA-1: a75c1e522315a8c78b7cd630e888525443494a77 SHA-256: 19d8c4d2dbf5f8c008c08c00328a463c19190dbebcaa061a2ba1f2859eb09544
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains numerous external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=chemical+equilibrium+problems+with+solutions+pdf PDF link annotation
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/bq23g772d5s9qgbgktvdd3a5s0/27800319996.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/polaxuxa.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160732b49401e7---27591999845.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/90657307145.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/jojufoza.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4943d110f---netemuwona.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/mje2bjp2gg2589vnur7n7pkd1v/56220496417.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/8151f1072b6cf20ebc5d04da12f5a855/12600751790.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/9df1kfrc997e1emob56vl8nhfm/sorifeveziz.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/eb2af8ae0f10e308ab35957b8fcedc42/rosaxixinavurov.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070db58f2441---divolejidibixonusafebe.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/qnjchucs31boi47iuemsemdl6j/juzejo.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b277190487d---90422239042.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6dc0b2b928---vilaw.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd430d4cf93---94417587924.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021050805295896780.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/ziwovirefije.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826551e9e55---18807132487.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/fevebaruwuvinoza.pdfIn PDF document text
    • http://jfkanacon.org/data/userfiles/files/sivitofesa.pdfIn PDF document text
    • https://kuepancong.com/contents//files/nipakevumizutuwasunaro.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/c65b06cd3168157da39a0d1d762339fc/7707295419.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/44137131107.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/duzudajinipa.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/98501706061.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01e6e3ce7e---vofij.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/gr5be1hvocmfk10t602fvskv12/gituwugoxo.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_off0000b572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB572 14612 bytes
SHA-256: 34515b7da5e04da4932191a63bb4666b7d6d3610b5dda6da939c1670413970b8
font_01_sfnt_off0000da43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA43 11388 bytes
SHA-256: f1c5344681bfb8f0ee50814cbce3f5f0d91488da18d81a5c0a34d1117e62717f
font_02_sfnt_off0000f491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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