Malicious PDF — malware analysis report

Static analysis result for SHA-256 448ca73332362980…

MALICIOUS

PDF

83.6 KB Created: 2021-07-27 16:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f71ffadb2f8649c7fcf5fd39108bec9 SHA-1: 05b7137b36ebce39ee2d1692d8a52ef02bb9932b SHA-256: 448ca733323629808cfe6612c07e370c5f72bf68f8d9b647d72a9cc54ccc1dcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to host or redirect to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/e0a5814f413d4ab70ca1a2ab1a854af0/88347123817.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/fdf08c4743e920bece552a4dd1381342/pijojaxu.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/910b8723776ab2e32e90ea8550184f48/tasogibagowivejilolomovu.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160e690be8308b---73792171035.pdf
    • http://thietkewebbacninh.com/webroot/img/files/36702258653.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/77300e585276a3840ec4fa07aa0dff96/45757139148.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/6b292853db23a2a89497685de485e8f8/74447479742.pdf
    • http://crediramasrl.it/public/file/18828362645.pdf
    • https://mmagame.com/userfiles/file/61650021212.pdf
    • http://endemic-capital.ru/uploads/files/kutafu.pdf
    • http://sangiorgioautoservizi.com/userfiles/files/94815210389.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/51cd496da22105e6521665771d6394d7/bolipagazugigovevik.pdf
    • http://tpdw.pl/userfiles/file/14033275793.pdf
    • http://gloucesterclassof81.com/clients/23558/File/79001451021.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b57c0b7cabb---16143948691.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0e60b071b---52946920187.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160777e0fa03b1---91915892307.pdf
    • https://phuketwebstudio.com/ckfinder/userfiles/files/65391846246.pdf
    • http://wrtour.com/FileData/ckfinder/files/20210713_B4E4D198686D3F21.pdf
    • http://moreit.ch/productinfo/file/powejutokavogu.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096fad0ca9ad---21312119966.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+print+with+color+mac
    • 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_off0000e4e1.bin
2c0d42bb6528061992c0a813cc00cc163ffa1f1754663091691943626e296380
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E1 10416 bytes
font_01_sfnt_off0000fc3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3A 16792 bytes
font_02_sfnt_off0001144c.bin
b42bad8131ff88263aac21b238a7d1f8bf92eab1034eb95e923f12c188faa4c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1144C 17016 bytes