Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8d0df93706ea87…

MALICIOUS

PDF

67.9 KB Created: 2021-09-14 01:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fe1402e5f70b6459e64b1494dc300f28 SHA-1: 2e1587906477e7902b233ed43d013da7f1e75c6a SHA-256: 7c8d0df93706ea87778b153d48af64ef4453d07599fc37087e0d88638edec981
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and exhibits characteristics of a phishing lure. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of a 'utm_term' parameter in one URL indicates a potential SEO-based lure.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2688

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://medvor.ru/uplcv?utm_term=haruki+murakami+after+the+quake+pdf PDF link annotation
    • https://francois-daulte.com/ckfinder/userfiles/files/70502112744.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/52385829288.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/51194965011.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/5f7gi9cf8qg15rl037o12mcmi7/sefonijedi.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/zimituwiw.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/8450364304.pdfIn PDF document text
    • https://loyd.rs/images/file/43656575456.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/voluwuzo.pdfIn PDF document text
    • http://intersonik.eu/upload/files/nezutijoluvevufeboxabo.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210912232508913.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/69247838904.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/wiwawovonipasefalokazu.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/difojazuna.pdfIn PDF document text
    • http://orthodoxnews.us/file/28620645424.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/70577892672.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/vutufupowuxen.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/wugumezegaxemez.pdfIn PDF document text
    • http://tfforming.ru/d/files/kiladuwonutesat.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/porotowirijake.pdfIn PDF document text
    • http://contua.org/userfiles/file/57518202657.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/janarojekonoki.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/794c22525e1b4e4fd6c36d3d09a342cf/jojigelotogunav.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135d8edede30---96811806498.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/riduxuwim.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A9 10656 bytes
SHA-256: 7f5ac9d4b76d4be32ebf8ac6bf4991d5a48ecdc7de7151b75e4389fbaf12b1da
font_02_sfnt_off0000dfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC5 17144 bytes
SHA-256: 1c69743a973c0a2c451bd2527630b079cadd1adfec768487fc038993eaddd0ea