Malicious PDF — malware analysis report

Static analysis result for SHA-256 5afb0756970e7112…

MALICIOUS

PDF

85.8 KB Created: 2021-06-30 20:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7278d3c9a899e84d06c8392c8f441ec SHA-1: fd274f7c62c033e57ddb5359c05ddd677cf7770a SHA-256: 5afb0756970e7112f348be154ca99b003a0fc3e4c60f22259ff8e8832a0ba620
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ulrike-mayer.de/userfiles/files/78561398506.pdf
    • http://medicaldistri.com/ckfinder_files/files/wuxubilogakujoji.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/81t6ufue5hgd05dru1onnn8ks0/tomobitukuzasitar.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160822151a45c6---16706555627.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/m4hn0v4e8jjqurcefkca0dmchl/libukageweraramozifa.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160706ff0725c4---48302318465.pdf
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/vanoleninapor.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e6ea900fc---xivunobetufufogeme.pdf
    • https://securitegenerale.tn/userfiles/file/48891916614.pdf
    • http://www.motionmantra.com/userfiles/files/visateg.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b55ceeb09---68561962329.pdf
    • http://ilovegabal.net/fckeditor/_upload/file/jubobowakixasurigazine.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160989c876351a---93866823262.pdf
    • https://kingcarmotorista.net/uploads/files/jujebajisiv.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/977509bc10e409ffa67fcd040a143deb/8659561160.pdf
    • http://nhasachnguyenvancu.com/Images_upload/files/38275987865.pdf
    • http://atut-biuro.com/uploaded/file/lodenofafik.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afa4a97ac6---46412444837.pdf
    • https://aletihad-group.com/userfiles/files/54897283077.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/d4d0ee63dc0a7841e028a5fe2cd05fb2/wadebiwusikotepogenam.pdf
    • https://daismene.it/file/6153048543.pdf
    • http://ultraljud.nu/bild/files/zuzarajipalezif.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/3592408bfc8a59334a6d633b44ed71f4/14519746216.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607247d8a672a---56796474850.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=convert+pdf+to+editable+word+free+software
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 16792 bytes
font_01_sfnt_off0001065d.bin
4ad0107191f8899837e1e239ea9f5dafec5bd406c0f6081d3077c9d56356254c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1065D 16428 bytes
font_02_sfnt_off000130f0.bin
715f1a717cce30bda6c80d53b625ca97c6d29c87df87cc74cb07064b81ec5e23
pdf-font-stream PDF embedded font (sfnt) at offset 0x130F0 10816 bytes