Malicious PDF — malware analysis report

Static analysis result for SHA-256 efdcc16563f37ede…

MALICIOUS

PDF

88.5 KB Created: 2021-09-05 01:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d047c81041900b46464fbb8a25acc31c SHA-1: f2bd3421aca535d316c98026abb44d3744246401 SHA-256: efdcc16563f37ede18a30b434cc0795d8ac84c1626a9782c01199f0ce9ccb611
164 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress sites and disposable hosting, likely intended to trick users into downloading malicious files. The presence of a 'download button' lure further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://eastmanllc.net/ckfinder/userfiles/files/10432040495.pdf
    • http://cestovni-postylka.eu/userfiles/file/mutotin.pdf
    • http://meskerjager.nl/media/files/dubojake.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/kilifusurizek.pdf
    • https://thefertilizerproductionline.com/d/files/tokile.pdf
    • http://worldcar.jp/userfiles/files/rinimukodiwo.pdf
    • http://fitviewer.de/files/file/39098904467.pdf
    • https://bloomland.com/sites/bloomland.com/files/semuwabibomozezebofoma.pdf
    • http://launensia.cz/ckfinder/userfiles/files/41510932935.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/tra0p3bh9aghqgfrsvgp21m59a/40361722253.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/08b8b1d751d9aa1c99c125679508ce73/29899570079.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607431f449aaa---sabonofazusepukenaxux.pdf
    • http://0930actress.com/files/files/42836134339.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3580d8619---vuvexutiwe.pdf
    • https://palcev.ru/userfiles/file/vamedanakoduwudipumew.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fe567150651---56193516406.pdf
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/jibawixosi.pdf
    • http://bhavalaya.org/ckfinder/userfiles/files/75251153892.pdf
    • http://www.veslovani-vsb.cz/soubory/file/dawifubafudifaji.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160740aa4d461f---tutuvaromuxumoletepesi.pdf
    • http://gorisum.net/fckeditor/upload_file/file/16126245175.pdf
    • https://harrisitalia.it/uploads/file/87806075960.pdf
    • https://taipeitccia.org/CKEdit/upload/files/vawijisixaroz.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ab7e602d7---8624901579.pdf
    • http://polkovnik.su/upload/file/35800304011.pdf
    • http://polkovnik.su/upload/file/pokewojumafolajasa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ser+vs+estar+worksheet+answers
    • 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_off0000f338.bin
c1c8b0edaf97e7d44fd096850b8e31d3f9224f56b7205bcd2e0ca34f80752d4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 10388 bytes
font_01_sfnt_off00010ac4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC4 16792 bytes
font_02_sfnt_off000122d6.bin
43693cb306863d556b0926f7f404a68f7954a31193227dcd45fb55024e6f7f62
pdf-font-stream PDF embedded font (sfnt) at offset 0x122D6 18744 bytes