Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d7a062f2d406cb6…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 10:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 448b54a284bdf68315ded1f217a9a6ed SHA-1: 2d6c42c3b593fee14717bbb4e4984e2c1a6c1cb9 SHA-256: 7d7a062f2d406cb6c9a66d6071acd8d4b7c81b00b6612bd8c094ffe910663981
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for further exploitation or credential harvesting. No scripts were extracted, and the document body was unreadable, but the link farm nature and heuristic firings are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://inwebjor.ru/uplcv?utm_term=how+to+convert+android+app+to+windows+pc+app PDF link annotation
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614ea48a98aff---18118212405.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/31743698077.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/71300881313.pdfIn PDF document text
    • http://hoogbegaafdennu.nl/userfiles/file/41185649196.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/73538677693.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/rataxavamoruvuviluluzor.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/judilasosuvijoni.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613db49d5d86a---xigajazeretaras.pdfIn PDF document text
    • http://8njl.com/userfiles/files/gibevasaliroduze.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/3051269239.pdfIn PDF document text
    • https://www.iimranchi.ac.in/ckfinder/uploads/userfiles/files/vujujomizunuxevikidometop.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/42302274394.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346a02e5cf7---14995924044.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/033181837a2a247e8b6f9c5d99b93087/47266755460.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614015c78ef78---busagoverawapexifotozowi.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/86517071593.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/31691955302.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136caebd1d25---51248060487.pdfIn PDF document text
    • http://arsvet.ru/img/upload/14221730864.pdfIn PDF document text
    • https://bselink.com/userfiles/file/77079656049.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/72404845737.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/54280d9d27dd8d463981eb2417b0f00d/19635853309.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/bavawininatakinalapulux.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/15795758516.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/katuwimuwanarorira.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/6003678273.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_off0000b312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB312 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB29 10604 bytes
SHA-256: 36b7a7f9fa483c1d784b9c2f9067a0b7d5f6be0d2af2e978376ca5ff223df7ce
font_02_sfnt_off0000e387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE387 15404 bytes
SHA-256: 33a243a02cc2ce4898f0d123ff8dd41c1ee88eab3ab1778a5a50177d75499cdf

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