Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa7fb7c5007ba75…

MALICIOUS

PDF

74.9 KB Created: 2021-09-19 12:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d83d74d4c343c315a931af595ccb3297 SHA-1: 955692000cd84286ac4a2b3dd60252fd88777fad SHA-256: 2fa7fb7c5007ba75da6e8adf1126d7f89fe48f1cab917d0d1cfffa7a7ac63f4f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to multiple distinct hosts, some of which are identified as compromised CMS uploads, further supports a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • 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://zhfangyuan.com/uploadfiles/files/teluxigiwadejinavegaven.pdf
    • http://byty-pardubice.eu/UserFiles/File/kekegekagolesexen.pdf
    • https://u-spot.biz/js/ckfinder/userfiles/files/33406925595.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/j1n6ea3l4enchn91gv0sda46h1/winajojakebibip.pdf
    • https://rireenfrance.com/images/upload/files/42998946629.pdf
    • https://retrofitoman.com/ckfinder/userfiles/files/lelur.pdf
    • http://multi-accueil.fr/ressource/site-image/files/84536896740.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137105c61cfc---67350230828.pdf
    • https://xtremefitksa.com/ckfinder/userfiles/files/40619827208.pdf
    • http://honeycontacts.com/uploades/userfiles/file/vifoziwox.pdf
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/1326000105.pdf
    • https://channeloflove.com/ckfinder/userfiles/files/94634260463.pdf
    • https://bititechnika.com/uploads/file/28490297928.pdf
    • http://liveranigioielli.it/userfiles/files/lerozugota.pdf
    • http://frutapac.com/ckfinder/userfiles/files/36963441492.pdf
    • http://tjchenxing.com/filespath/files/20210913143054.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614137fab94ea---42979295623.pdf
    • http://zvaracskaskola.eu/editor_uploads/system/files/21882106117.pdf
    • https://yenicekentkaplicasi.com/userfiles/file/pivetifamufotelobak.pdf
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/purenomumu.pdf
    • http://steakpluspizza.us/userfiles/file/89566425040.pdf
    • https://cmf8.ir/data/file/59091601157.pdf
    • http://verzorgingsindex.nl/images/uploads/80163659801.pdf
    • https://actionsporting.com/userfiles/files/sogudebupakujusu.pdf
    • http://leadingedgecorporate.com/user_images/file/12266473712.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/qpeuc8lhb1p3mml6h7sfd5bb64/kezir.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=screen+flashlight+apk
    • 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_off0000be27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE27 16792 bytes
font_01_sfnt_off0000d63e.bin
d353890fe6602ecb079963993520ed0947fd3540e337d04c8f05e42e902c49ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xD63E 10804 bytes
font_02_sfnt_off0000ef0e.bin
1bb69c8df041c2c18c2c344b0d8e771cfe2af15001f216bbbf91c580c1debfbe
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 18072 bytes