Malicious PDF — malware analysis report

Static analysis result for SHA-256 a525802f00e76e4a…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 12:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ac86ed97086bac17b391638a5c81712 SHA-1: 12c1eb7e1925b0c623e1b7e03c57445620220b3c SHA-256: a525802f00e76e4a28b1f74da713ee55466691507bccc091826a1aceba64ce7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites, likely to distribute further malware or conduct phishing campaigns. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true malicious intent and potentially leverage SEO tactics.

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://traicaygiasi.com/Images_upload/files/redes.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/164e4cf925ed1b7dc80297b5e385afbd/86767530136.pdf
    • https://zapcdn.space/web/img/podborky/files/23719135978.pdf
    • http://akicgiyim.com/userfiles/file/vuzesanuwobaz.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/71a92f04e4663f6049613fb66298c9c9/9125838711.pdf
    • https://malashealthcare.com/userfiles/files/kawoponusuxodigom.pdf
    • http://888chji.com/userfiles/files/fikadejosidesusutisagiga.pdf
    • http://thaiboxes.com/piceditor/file/56670356959.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/obu8552799uhbgpgcllguc7bjn/95521422852.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/e5eccd8d6b7b80282aec14356516837e/63573248215.pdf
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/25aaeac4d6775772e6e3af1b3f67bea4/xegewewesaluba.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/d7a383f3f17b9475d7d15b7b8fb33545/limuvarizenuvofosipisod.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160999f61d106d---xafukufekuwopatezizotilek.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609495db4d21c---furaxijomigaz.pdf
    • https://xlspandoek.nl/userfiles/file/41886012424.pdf
    • https://drivetripper.com/userfiles2020/files/14485952508.pdf
    • https://capitalsyndic.com/userfiles/file/wizepovozoxe.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/ljg4tl9ro0bm3ml55bn0497695/jaduvevef.pdf
    • https://sportsslife.net/upload/ckfinder/files/31301554809.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161204fc31133f---tukuwafixogejuvozana.pdf
    • https://rowsontw.com/shopadmin/upload/files/gebinetogapamurerekimofa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=regrouper+les+fichier+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_off0000db5c.bin
a7a061fe654beba1075d1284ca68d437292a126cf0c53ec63c3b5c44015a5373
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5C 18772 bytes
font_01_sfnt_off00010aab.bin
ed75943c32aa837f99b23303d78a9118062e8412bfa2f4d13e65500250701585
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAB 10680 bytes
font_02_sfnt_off00012309.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12309 16792 bytes