Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9aded0c8f4485ee…

MALICIOUS

PDF

86.7 KB Created: 2021-09-19 18:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6414d4895dbe92ac4e8d163814f88c4d SHA-1: 8ac7049446cf3e00bef5bbe7716ebdbdfe3c81b1 SHA-256: b9aded0c8f4485ee1557b20ff3ff04d9b6d66c17da348faaf7d27a03eb7adbb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=dokkan+battle+pc+hack
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/66079504269.pdf
    • https://retrofitoman.com/ckfinder/userfiles/files/lelur.pdf
    • http://kayapalinakliyat.com/file/kerikufebabeva.pdf
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/39665537420.pdf
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/dozekekomuduxub.pdf
    • http://nusamulticentralestari.com/Uploads/userfiles/files/98098175707.pdf
    • http://incomingmakedonia.com/files/files/vezelo.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/37187eaa0405c588a0e0f13eed50fd96/72837058928.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143678f80488---57834102801.pdf
    • http://strelnicebudejovice.cz/userfiles/file/jarobebur.pdf
    • http://salespate.com/userfiles/file/11394507742.pdf
    • http://sgrdpandher.com/userfiles/file/didowux.pdf
    • https://alnahamgroup.com/userfiles/file/492972.pdf
    • http://kristiankutschera.de/userfiles/file/35124784954.pdf
    • http://kimwendelldesign.com/ckfinder/userfiles/files/57932071835.pdf
    • http://sonsuadogo.org/Images_upload/files/xikigediriwuvudiradigav.pdf
    • http://jindi2010.com/uploadfile/files/wigolixuvafibe.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/d1f9fba92291dd036457764d279544ec/18066145471.pdf
    • http://cinebuzz.be/uploads/userfiles/files/77064463600.pdf
    • http://yousefmaktabi.com/ckfinder/userfiles/files/xiwabagodim.pdf
    • https://psychologgia.pl/Upload/file/velanatejanozolavuwane.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mjd9srj2469ef8s4q76jci1jk2/30768129294.pdf
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/tubogezapos.pdf
    • http://topspeed4wd.com/ckfinder/userfiles/files/xipilinefozopipaserulif.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_off0000edb7.bin
a5e92050cb1b3306f8dea61bcfc10d85c892759e0e2cc521aeefbfea8f15b941
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 18476 bytes
font_01_sfnt_off00011e04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E04 16792 bytes
font_02_sfnt_off0001361b.bin
d5bfb0c2c92b51107da43db42a97662b997430502307bd978e657fd9f7acc27b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1361B 10344 bytes