Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57bcc2f083ca81d…

MALICIOUS

PDF

70.3 KB Created: 2021-09-02 14:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be57946fa2a34cd078d9e212031d5ee4 SHA-1: 49afa4eea45494a47475d9ff3d12bd7c3222d7ec SHA-256: b57bcc2f083ca81dc339634a769267c57fa3cfd883a0adba8cc4337e0417f034
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs that likely lead to malicious content or further infection vectors. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are designed for SEO manipulation and hosted on disposable domains, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6736

Heuristics 5

  • 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
  • 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://nomylo.ru/uplcv?utm_term=tes+psikotes+ui+pdf
    • http://applecentervn.com/uploads/image/files/tixidetesasajexo.pdf
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/rajazuj.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/56c4309689598c3859222de059a40997/fukojevapasijebipad.pdf
    • https://fortworthdental.net/cmsCart/upload/file/reranaxujopa.pdf
    • http://agataklimowska.pl/userfiles/file/darigivobukapamifoxad.pdf
    • http://gift-founder.com/archive/upload/files/pazufakeg.pdf
    • https://aulacvn.com/upload/fck/file/6604067452.pdf
    • http://acmemask.com/upfiles/editor/files/sifojilurijejepawojafapev.pdf
    • https://hometutorsdelhi.com/userfiles/files/25797638174.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/sa1rbqm11tte9iqs4md7mn42l4/sedidapino.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a73bb613b6c---95949151350.pdf
    • https://onwater.my/uploads/file/65721473725.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/760eae20e040320e29d1f7c49bae0a2b/81794849358.pdf
    • https://yingzhaoliuart.com/upload/file/35831635912.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ni2mjcop8b4n6l3q40733rkkf3/32339725495.pdf
    • https://china-glass-mosaic.com/userfiles/files/20210604_004610.pdf
    • http://www.mezmat.ru/ckfinder/userfiles/files/gunerejimabuxerivefuxakax.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/23b35a281b64f4263768454c7ac9c494/86273149491.pdf
    • https://hijaulumut.com/contents//files/xibividarilewoxelezuxed.pdf
    • http://donateagift.eu/userfiles/file/43505319410.pdf
    • https://ubranni.com/uploader/files/73433033210.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ceaa.bin
e84c686b452bf65a2fb68eea1bf5ad018c2ceaf0b443b9d6634fb1d7024be66d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAA 10232 bytes
font_01_sfnt_off0000e5cd.bin
1e9adaeac9356898ea21bd0ee850662231ca9b53c61a8363eccf83875b7b01ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CD 17600 bytes