Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf28b7f702791d1d…

MALICIOUS

PDF

84.3 KB Created: 2021-09-11 06:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1ca46d83e8c803e919b2840e7028f086 SHA-1: 18f2de4f31c3b04eb0703e9a214ca5e501cccd9c SHA-256: bf28b7f702791d1d5ab05b64287ab98fef02c2e44515afcb290cc9f1bb4bc1ea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to disposable hosting or compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://sbairs.com/datas/files/9169552010.pdf In PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb6f61a0d2---25638325857.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/lisibowaseseladibitikuw.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/xubofedaligegatata.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/teperisijebi.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/47145091300.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161356b4787f42---40598691206.pdfIn PDF document text
    • http://epicridesnepal.com/files/woxoli.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/jipofebefiravuxukowa.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/91mcjc7fgp8o5ovbl5b98mrdfh/39674653284.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210903035154.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/sqs8o1dk7ucu0jmi7ipqbv2de1/xaxinetazigek.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/32612710720.pdfIn PDF document text
    • https://krossi.ru/images/content/files/57493604158.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/3sphmk6p2c59cofdm2ufiqc4m4/83746797523.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/depinezabitipemenodunop.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/40740085802.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/pumifage.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/kimavubiba.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/82599364102.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210903_F8ACF3FA33719EDA.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/64700035535.pdfIn PDF document text
    • https://doitoutdoorz.com/file/JWrmfuIG6g4unxF5.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=link+assistant+rank+trackerPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE402 18704 bytes
SHA-256: fc09273c99f08d63ac60acf47435464d15fad6b82d78d0eaa0b8288063a4d778
font_01_sfnt_off000114d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D1 10108 bytes
SHA-256: d625eeddac750acc3c9902535593182867e4a5ffb63a7bee66349d8d2d28e47e
font_02_sfnt_off00012b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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