Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd83964b70afabf…

MALICIOUS

PDF

73.8 KB Created: 2021-08-28 07:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 440d26e4120df4d07953aae1f34cb237 SHA-1: 16fea8b55b909c03ad067fc4366f33171244519a SHA-256: 9cd83964b70afabf39e97e8ee1ed4123d2efc31698025aa524a5026c2b2d8923
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document's structure and embedded links suggest it is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/zotovavopel.pdf In PDF document text
    • http://sinojjacob.com/userfiles/file/lezanugarixiwurifutajato.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/19f75fb42c894478c2dd762476cecf35/zotut.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/semudulofabuz.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a89a2690988---78857398752.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/ae55474055e915d3960873efcf03ca6b/61457947758.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160978f980a78f---83581501525.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/4cf0d24a64f7dec3dd39f583a63a50aa/xatogafifozuzegi.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/jawarisebijosazafiwunaw.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/nekotojurunowokomu.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/94360278177.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/2nt94bn1kg7qsnqadc8haibnsh/95865401687.pdfIn PDF document text
    • https://webhosting4.net/media/file/37710506172.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/tafuvoboxox.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7913d9466---mufelizavepetumafovasurab.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/14434132320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=6+multiples+of+6PDF 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_off0000c162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC162 15856 bytes
SHA-256: 844b3114101335da175025708d0ca631bd472db5601a2a3efb8cafb081ff8678
font_01_sfnt_off0000ea1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 10324 bytes
SHA-256: e86dc558f7dd3d3f6f9d1efa8974f1e822125f7f6d0b484a7e0438407e22b814
font_02_sfnt_off0001016c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1