Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ddf62b1bd08fee1…

MALICIOUS

PDF

68.1 KB Created: 2021-10-02 12:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0200a1aad364f1bcf3f14c53a69150cf SHA-1: 90037e00ef2ed3301ef79903ec7a9e855c7de77e SHA-256: 6ddf62b1bd08fee1b4f0c21881d727522159e22e3e8c720b523e0e615de4d986
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Multiple heuristics indicate the PDF contains a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs further supports this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424f47b5781---19747621739.pdf
    • http://apart1day.ru/file/41457921206.pdf
    • http://ideatity.com/ckfinder/userfiles/files/xeguxofururumizesozezugup.pdf
    • http://alexlunacoach.com/img/editor/file/wajutuvexilad.pdf
    • http://truhlarstvi-strakonice.cz/files/file/56070660239.pdf
    • http://kwong-cheong.com/userfiles/60858297968.pdf
    • http://computergramm.com/userfiles/file/gimiruzuva.pdf
    • https://matfplayer.com/calisma2/files/uploads/62715286027.pdf
    • http://efuturesthai.com/uploads/files/5678798663.pdf
    • http://www.vegagastro.pl/upload/file/87694992839.pdf
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/99023408492.pdf
    • http://tetraeng.it/userfiles/files/tilirowuropuvaxatolugasom.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/a95c54f97440f120d85bec1efa3df111/58834902171.pdf
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210923_133507.pdf
    • https://pmms-online.com/assets/file/71532708467.pdf
    • http://shriadinathbank.com/uploads/14743630896.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/47huvjpdv8cuq2lgjqj774lol8/16081334280.pdf
    • https://pearproperties.in/userfiles/file/viriwasixujodaluvuxulud.pdf
    • https://mobiligennari.com/userfiles/file/vilibuxuki.pdf
    • https://iaido-iaijutsu.ru/userfiles_exc/fugomatuvupizejavoledi.pdf
    • https://guadix.co/ckfinder/userfiles/files/71615556263.pdf
    • https://lifo-sea.com/ckfinder/userfiles/files/57786340604.pdf
    • http://xn--nellieskche-0hb.de/userfiles/file/womefavoraloremezenobelos.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+cheat+mobile+legends+bang+bang
    • 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_off0000ae10.bin
f3f7d1bbb7dfcf49c5034b796c25872f89d40cc1c70f476e5eb77badd20b93c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE10 14400 bytes
font_01_sfnt_off0000d1ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CE 16792 bytes
font_02_sfnt_off0000e9e5.bin
a4c7174b70ba7bf4058931da3e026e7181e27b815a78b417f949ddb51d9c253a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E5 10936 bytes