Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb662bb57e685aef…

MALICIOUS

PDF

74.8 KB Created: 2021-09-02 07:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 872feb4da9856461dac326da630d650a SHA-1: b38b2fd97ffd6e152a181e76f752c275bb76a4d6 SHA-256: eb662bb57e685aefa640c3d1150b332659d35edbb66ec40936869b03062aea66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting sites, likely intended to redirect users to malicious content or download further payloads. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://morard-mcf.fr/data/Files/17559956517.pdf
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/60648901584.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa7b20a47---mepivizetelumuwa.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16103f27f716e3---30769283765.pdf
    • http://kleinschaden-expert.de/userfiles/file/folibeduvurudosader.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/u55sf421dk74dt56qq5qsu2c1h/22471917614.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/96926013092.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/726792e1e7418272b371a06922f8377e/damuzosuzadule.pdf
    • http://machin.kr/userData/board/file/49372213060.pdf
    • http://maintogelonline2.com/contents/files/pekonobuw.pdf
    • https://fonixkoncert.hu/upload/file/33873719409.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/uvv57gb6mg9ptcov6gl6oakqb3/puzatuletamuxoropo.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac3b9e19ed---dukosezepawemakanonezo.pdf
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/30938495898.pdf
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/89473566658.pdf
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/rufojulovaxalusomafewij.pdf
    • http://computerdoki.hu/user/file/mejadum.pdf
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/43195161199.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ift0ouo7vsmoi6nskksmjcqqi4/sofikinimofoxepolutejugi.pdf
    • http://hydrem.ru/images/file/kajib.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af36b0a406b---xagokilugemawow.pdf
    • http://tfh-filter.hu/_user/file/zaboletepajuxak.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e2c3ca56e---vexarok.pdf
    • https://easternresources.net/ckfinder/userfiles/files/gijedopezop.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=circumference+problems+worksheet
    • 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_off0000c270.bin
61ed1d269527c5241dcbd53bd3ccd1bc36c7935708db00414269943c078e331b
pdf-font-stream PDF embedded font (sfnt) at offset 0xC270 15864 bytes
font_01_sfnt_off0000eafc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFC 16792 bytes
font_02_sfnt_off00010313.bin
cdc08ecf1b297c7a393be5c3f3db72b704f98bf24bea3ed0ebe9c3a7c3e24eef
pdf-font-stream PDF embedded font (sfnt) at offset 0x10313 11032 bytes