Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a727aefa8fb4fb…

MALICIOUS

PDF

87.7 KB Created: 2021-07-01 11:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ad0cac4ae8196e8b953a8937f5a027a6 SHA-1: 73d104d02f730c079825e6d72b813c85326bb66c SHA-256: 93a727aefa8fb4fb2f1125ad993b3c675cc4a28c7a7e084865e5b7f177c581be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The primary goal appears to be phishing or malware distribution by leveraging these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=the+bible+of+options+strategies+book+pdf PDF link annotation
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9df93eecc5---vebakeposigizunitelatod.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/5fe3c1cab8af7782807271ac678488be/vifibogoxija.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/gbtggdn9bjc3gac20ri6qiaiq2/sekuzabapitusedofikexi.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/putizevodubo.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/24786858448.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e225de3d18---90648490147.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/jimekipikelokinowori.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0530/ddcf92c0cb72b647be998a4eb16c0748.pdfIn PDF document text
    • http://webbuilders.com/files/file/98200720553.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/renexiluberoj.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/7e8761c63fd4783a06a763e7e98e146c/kisonobezurus.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/0ec17a7de9a2f581e3617adffe95213c/bamebumirikomudibuv.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/pemofatig.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075547372cce---53661984390.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/nidenalener.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/85734934779.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160762ee3b5813---2063738370.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160998ef328ae9---16165027299.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dfb523329---javiditazeliwanuvewazunun.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/7fld037en9djq4bb0k1mk3e8d2/fezix.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/38178834581.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/rjo97mo0gja45dgdq2mmdcoght/58895241920.pdfIn PDF document text
    • http://kleiberit.ru/files/file/bidowikitur.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/5jc45bprphm0ei37juedf4hi0v/63814808598.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/271ba433d944b5541f6dd1e0cd24a5f9/weledesefalofidanetenuw.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_off0000f3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F5 10972 bytes
SHA-256: c40cfb805d59fbbc296348d0b70ca5652807051d8a6a2697a69f3b7d0fe312f6
font_01_sfnt_off00010cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEC 17228 bytes
SHA-256: 70b0246dfc6bf3bcfb59e2aed1dca45f0d517adec708e70085d8f514a10c06f1
font_02_sfnt_off00013a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1