Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a529a47928266f…

MALICIOUS

PDF

87.0 KB Created: 2021-08-18 14:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b928704afeb553877e2bdcc3e46b37a SHA-1: ea2773943596309adea373f03d075cc1080674ee SHA-256: 14a529a47928266f461eee9d30db806a8df696265f5eeb71e0edecca992f0c16
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://oniceh.ru/uplcv?utm_term=typing+master+pro+free+download+full+version+with+key
    • http://strahovka66.ru/userfiles/file/tekel.pdf
    • https://moveo-sport.pl/userfiles/file/garizaponogagar.pdf
    • https://vandolderskb.com/images/usr/84107677899.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d683045dfd---47268324461.pdf
    • http://bonfiremadigan.com/uploads/fckeditor/file/22204415056.pdf
    • https://addsfly.com/userfiles/file/18160399367.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/6613d4990cb1470f09cc540b8b15f782/fazufutip.pdf
    • https://iqmuseum.mn/uploads/files/sowetevata.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099ed2900ea6---jujumerurerojazefe.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/botorukutiwed.pdf
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/51219550738.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160834551eebf5---lakerelisidotibok.pdf
    • http://nlureunion.com/clients/33063/File/devozu.pdf
    • https://solo-enoant.com/content/files/files/94965708724.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/8020727f8318086e0f81fe66dad3cf96/falelafisarevipugexejiw.pdf
    • https://cakenepal.com/userfiles/file/dejatedotoworid.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbcf0ee37d---12649231457.pdf
    • http://101eyewear.com/luutru/files/rijizo.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/a50a85f819cc9038db21fae54805dc46/vewit.pdf
    • http://studiobaliva.eu/userfiles/files/18294373249.pdf
    • https://xo-sound.ru/userfiles/file/sariwisewesokenax.pdf
    • http://smeclassof1987reunion.com/clients/37165/File/zipijadobidejaxemufidu.pdf
    • http://minipit.com/data/files/robugunororinawutifowiw.pdf
    • http://taiwan-casters.com/userfiles/file/dofabuluginuzidofof.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/bdafbd6c5c14a95be308f5055488e8f9/wozezub.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0aa857355d195899eef1197bc2416e77/tisikabopozug.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6e8.bin
4e67f15720840ed089358ecb8055f64fc55c2692754c058e220e134e1290b3ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E8 11364 bytes
font_01_sfnt_off0000f162.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF162 16792 bytes
font_02_sfnt_off00010974.bin
3822323c782868b64126f65a3970b53c01d209c6bb4a6ebb08fd2f17415461eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10974 17392 bytes
font_03_sfnt_off000136d4.bin
0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855
pdf-font-stream PDF embedded font (sfnt) at offset 0x136D4 16376 bytes