Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efadde945563166…

MALICIOUS

PDF

76.7 KB Created: 2021-09-20 03:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 418c97d2882aaf5f8521d1a09806d5de SHA-1: 5e2bb903160c166741e220389efdcc093e97ac31 SHA-256: 3efadde94556316603980fd6880a56fa68c832652ea4429f2f850b4195cf91c9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or manipulate search engine results. The document body is unreadable, but the heuristics indicate a malicious intent through its link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/aqdai2e5lfhq106i5espia5ev2/60307571321.pdf In PDF document text
    • https://www.karelo.com/uploads/File/tupabiwixalazogakaxakor.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/nowiluvedudipikaxinefeso.pdfIn PDF document text
    • http://vhktn.at/images/content/files/28174926597.pdfIn PDF document text
    • http://boldogelet.hu/media/mepexinokuwavabofat.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/15574347077.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/madaduwusumeto.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16142e38612d4f---zefikibinezebot.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a5f395076---54433722318.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/792465860.pdfIn PDF document text
    • https://protum.se/file/kepajurutovoriwalut.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/65106208427.pdfIn PDF document text
    • http://steinemann-ag.ru/21465793330.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/786o5sbktju3mbhbleari2c249/kinopeve.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/24008706454.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/dunotijapukapinuta.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/levodabivek.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/45966515921.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/53733420958.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/disezonogirebaj.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/54758099718.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/57404996108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=custom+watch+faces+wear+osPDF 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_off0000c740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF57 10576 bytes
SHA-256: d6133e575f9f945382aa57cf9d90e7d037a6406a3884f894b8cbb26dc4ca8149
font_02_sfnt_off0000f7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A3 17652 bytes
SHA-256: 235d4fcb4a16f0aa754e6e84c0acdae3bc3413ed6539bcd22ef6e9460becab09