Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd2274498d43cb2b…

MALICIOUS

PDF

71.5 KB Created: 2021-09-28 04:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b8e97be7e4f98ab2604f472ead54fa59 SHA-1: 416149904e2d1bd72279f4745e48e78f18fbfb6c SHA-256: bd2274498d43cb2bade634cc661cba850e5fea2b064d69dd614b5364e11d403d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting sites. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://purofirstli.net/userfiles/file/gawudow.pdf In PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16151389180a4d---61669155698.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/tuzesepowebika.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/fovugekesotax.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/91831058908.pdfIn PDF document text
    • http://letdentalab.com/img/files/86966075096.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/bonuwim.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/69157422914.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/6136f1d437f04.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109020609259705.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/71rtue1et1vl4a7ae2tjg3ek4f/12737746502.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/15426417141.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///85746924120.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/2217221142.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/mulapopufipo.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/1306327032.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/74733960726.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/66816327169.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161519e3911dfb---jelok.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/wuruzafadidivekaza.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/wutukazomubul.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/73681393163.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/60164190987.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/19499580925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=sufna+full+movie+download+720p+mr+jattPDF 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_off0000b387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB387 15912 bytes
SHA-256: 366709cc34c45674e9723c9a7757586208ca58cbfe9d1956c6e71e7cd5d89e2e
font_01_sfnt_off0000dbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF5 11240 bytes
SHA-256: 7d268dbe64f18bcb0989d236f6ec653081c24f8519fe6da0d08b5b579de5c3f3
font_02_sfnt_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1