Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35a011f0a2a31eb…

MALICIOUS

PDF

91.1 KB Created: 2021-09-23 17:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 927a887da604c1df807eeb24834d191a SHA-1: 2dc11beee3674252e52a09cae384bd56b218ffc1 SHA-256: a35a011f0a2a31ebbeeb697925935d07c424f1cd07eb9d9d2f8d42c50f3cbcc3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, some hosted on compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://radio-salsa.fr/php/rs/filesupload/file/futimerufamijune.pdf
    • http://toyotacri.com/userfiles/files/mazerivonesivabogiwekulu.pdf
    • http://progettocecinacuore.it/writable/public/userfiles/file/rexeme.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/d616f3fbb149ff63501eb012b211496e/55705184723.pdf
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/55225803559.pdf
    • http://lexus-custom.com/js/upload/files/23871534342.pdf
    • http://awkontrakt.pl/ckfinder/userfiles/files/91529901060.pdf
    • https://zoomkish.com/basefile/zoomkishcom/files/40566079472.pdf
    • http://ks-klinika.ru/ckfinder/userfiles/files/jawibugog.pdf
    • http://beloezoloto.ru/userfiles/file/59651298334.pdf
    • http://baloneacessorios.com/_upload/file///23909819319.pdf
    • http://safiorida.nl/operatori/userfiles/file/demisugime.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161359eb01e4c9---dibuduzumogozapagagonuxa.pdf
    • http://rent-lease-no1.com/userfiles/file/20210903095528.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b90adbbba4---weluzajuxunegefebelafe.pdf
    • https://betenenergy.com/sites/default/files/file/791127168.pdf
    • http://msinziniering.com/userfiles/file/vubives.pdf
    • http://anindecor.pl/files/file/pevavav.pdf
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/vomosumijogotefokunek.pdf
    • https://orderpoet.com/ckfinder/userfiles/files/zosinabukew.pdf
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50970384549.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0d19b86aa---8532501109.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=appstore%2B%2B+download+android
    • 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_off0000df3b.bin
ec4fd8baaea5a2402c95e8557df10e88c32a714023d80ccd9d5d87a16906ea55
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3B 19352 bytes
font_01_sfnt_off00011109.bin
f729040cd9bf2b7a587cc44a4a980da35df8fd8e8c966ede76ee5c9f3c0b8307
pdf-font-stream PDF embedded font (sfnt) at offset 0x11109 10452 bytes
font_02_sfnt_off000128f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128F5 16792 bytes
font_03_sfnt_off00014106.bin
a1b7c47b773907ae73db1d2801e6eeb5fd6df26e3a9dc7ba5fcfbdb1bbdbe06a
pdf-font-stream PDF embedded font (sfnt) at offset 0x14106 18352 bytes