Malicious PDF — malware analysis report

Static analysis result for SHA-256 da20a47af01a93b9…

MALICIOUS

PDF

74.7 KB Created: 2021-09-01 23:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b4abb1db654d99ecf5672d0b53c72a29 SHA-1: 7f1e1869f3844a52a2677b307be857831acda02a SHA-256: da20a47af01a93b9cd0332be76d1e89deb299a1442a0f2128f230e2f5f6e2c0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL analysis point towards an attempt to exploit user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/87dd70c8fcd75c7a1ceb0e36265acc61/gojirowo.pdf In PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161198b447fa92---2831623190.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/pedos.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/viwew.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/91509953931.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/papofekulobebagewemugot.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/26648737158.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/vakukitafipibum.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/zajonetalabaladubiteg.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-21/20210621075746175107.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/vejivomexowoxazononufup.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/4309b4b77bb1870aa1309d4d29862101/sesax.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/65025844589.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210811_071805.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/wevudemaxudubumadago.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16077e6a9e605a---fifivojibotujetizutuvuv.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/figiwuxebar.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608476413afaa---74510929661.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/jodibas.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/nazazolebumiwoja.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/d58f154snecdbb2d6lcj4ugkr6/45739562753.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/46cc7c802e06da389bfbade1fa59a113/40168525385.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608af5bea6a8c---45554461067.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/digej.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/87543230720.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d263bfb06508d9e30278f11e35fba337/webepusatakuvepoparuler.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=recommendation+letter+for+fee+concessionPDF 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_off0000c364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC364 10684 bytes
SHA-256: b895be35eb2a1e358aded870986317a737a7f244fb441e2851e8ad65a6ad26e6
font_01_sfnt_off0000dbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 15580 bytes
SHA-256: b95a03d0550e856b41f9d727e68479307d40c56bc3b467198cdb61517f797982