Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef610bf021a2cc1d…

MALICIOUS

PDF

81.1 KB Created: 2021-10-09 17:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c7de0e9a54f3368ff78b4a1d6a55127 SHA-1: e9f9fba1f91d6a97bf84457e6a31e00bd0a2cde1 SHA-256: ef610bf021a2cc1d41c528d4df742ce1377beb4cad1acdcb5766dd19a08664dc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and link farms points towards an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://jobcred.com/rk/jobcred/uploads/image/file/42019973999.pdf
    • https://www.terraton.com.my/ckfinder/userfiles/files/sijutibuzepaledumi.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/d4vjeva1dr43f6tbvrsji6gbql/gamojurawevunamagila.pdf
    • https://ashleymongolia.mn/uploads/files/76082507561.pdf
    • http://bright-inter.com/file_media/file_image/file/sopodereresudabililetep.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/49795252063.pdf
    • https://cambodiadriverservice.com/userfiles/file/86891033987.pdf
    • http://smingames.com/ckfinder/files/sutijapikeka.pdf
    • https://przyklejki.pl/userfiles/xodok.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/161447b9cb47e3---55186272391.pdf
    • https://cherrychile.cl/cherry/uploads/contenido/files/teziravuza.pdf
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88032467765.pdf
    • http://pcserviszlin.cz/ckfinder/userfiles/files/zegenagopasaxeli.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/1lr19kabsec2usd61tea0l32as/41085687836.pdf
    • https://landatur.com/files/galeria/files/29256256043.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1615c8492c89cd---11534426423.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc38e46052bcab9c6739400a3e55c12b/zewoworitokotudemet.pdf
    • http://antifftech.com/uploadfile/file///2021100723131083.pdf
    • https://strefaokazji.pl/uploaded/file/ligoxukavekapivij.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1615a53a93b39b---supipo.pdf
    • https://stopserv.ru/files/file/lodatogakemopozepivosopaw.pdf
    • http://dubilex.com/userfiles/files/38628291584.pdf
    • http://vallovin.it/userfiles/files/xebomasuge.pdf
    • http://metabolizmusonline.hu/images/upload/file/77468362213.pdf
    • http://dip.natura2000.pl/imgturysta/files/28083220168.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+turn+off+private+browsing+in+safari
    • 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_off0000d6e5.bin
c26a3cb435e5acb4082f6b8ec43a9f24435de4047a9bf39be8b4f200512aeced
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E5 18288 bytes
font_01_sfnt_off000105b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105B0 16792 bytes
font_02_sfnt_off00011dc7.bin
10a3f4ff8b227afba716014b43f8e6c3f8dfc72313484f6876a56a5b02145191
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC7 10872 bytes