Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae56cd969b347dec…

MALICIOUS

PDF

105.3 KB Created: 2021-07-08 03:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4994ec67cdb0de9475e18eca294800f2 SHA-1: f48f4162ef4240ea99e63fcdf9a9e76c9b7ce23b SHA-256: ae56cd969b347dec2ef213570e264be3172037ce5d6361baf94fa0aac71f3e8b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://queure.ru/uplcv?utm_term=at+all+times+i+will+bless+him
    • http://studiosimonepantaleo.it/userfiles/files/40821985954.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609434401fbab---85626420528.pdf
    • https://vigiweb.cl/dinamicos/files/file/45793357980.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d2b538b6---11887369865.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0ecc03735748b54d883dad4084192a61/83026353727.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/d6b20030de4a241020afbcbb8f60e36e/lugelago.pdf
    • http://funperm.ru/content/file/nevagumus.pdf
    • http://jorkurojus.com/userfiles/file/jefisobemujusolak.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9da75e3d8---44531916535.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a050796c7---67432038701.pdf
    • http://akcjonariusz.com/UserFiles/file/18697293081.pdf
    • http://ahkjt.com/upfile/file/segixuzutanapuzedireduxu.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607974536a2a5---4242873613.pdf
    • https://alternatifhirdavat.com/upload/ckfinder/files/nisozodaborofipodelaw.pdf
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/xupolowekefitoxerew.pdf
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/25236511926.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/fk9o6a8dd55grv3jv05t0qonj0/penuxujiwiroxoka.pdf
    • http://birnagarcollege.in/userfiles/file/20109317745.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/826575ebbfb70eef123d68a201947826/71571547422.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac677e64fc8---furuwebote.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a36f3a1a5d---30211503016.pdf
    • http://aep-tc.com/cache/fck_files/file/54519218689.pdf
    • http://simonhoirup.dk/userfiles/file/viwowa.pdf
    • 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_off000138ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138CE 16792 bytes
font_01_sfnt_off000150e0.bin
187174babcf1e380558afc6234cd51c360c299448b6b2152730343cff887cf43
pdf-font-stream PDF embedded font (sfnt) at offset 0x150E0 18036 bytes
font_02_sfnt_off00017f78.bin
f3cce6eaaba0e3bd833781b241ca3145d1f750ae44500772fac47e417efb8000
pdf-font-stream PDF embedded font (sfnt) at offset 0x17F78 10256 bytes