Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f49f1e8d4da1b14…

MALICIOUS

PDF

77.9 KB Created: 2021-06-29 04:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab7a0765a8365f5ffe2bb38fa8cdd6e0 SHA-1: 53eb7218a02a0d3877daf03db5bcef5218c79e63 SHA-256: 0f49f1e8d4da1b14f8451eb076d657433bfa07e79c48600d84eb2b6e79a81974
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm containing numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=42+the+jackie+robinson+story+full+movie+free+online
    • https://auto-rujo.com/images-editor/file/lekeselurakiruvixada.pdf
    • https://ahha.az/userfiles/file/sofizibebotu.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16089abaa6906b---vunubot.pdf
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/86938231428.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608e40fff127f---90674033723.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/a79921c844b5113f129837d47392658d/93017839367.pdf
    • https://cevhertemizlik.com/userfiles/files/wenatabozopu.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a73fa070335c79f7ff1bfd4b147f4cbd/perunu.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160746ab178601---14000734918.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/c8bf58651144fb80ab4b85ff38233c59/radijewuve.pdf
    • http://tevukasveza.lt/ckfinder/userfiles/files/nuparizosiliwasurovopomot.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/10220d1f3ec5b120d26534dd543df9b6/41163746047.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20f362e57e---xipenepanodewije.pdf
    • http://hodori247.com/uploads/files/bilebajebono.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/m3hc41nkr1ebsgatt17dfnc698/35972429991.pdf
    • http://penzionklara.cz/userfiles/file/kuxutavila.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf7edae3cb---vijerubanonewatamukom.pdf
    • https://afayl.com/userfiles/file/60199177499.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/2b06fadcb39eff8b47eb0c7641c567dd/59995823950.pdf
    • http://joyear.com/ckfinder/userfiles/files/1303218012.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/ba72e988614e4a9ec595ad2f6b073af0/nufukalatebimusufugikej.pdf
    • http://gasthaus-steinkirchen.de/img/editor/file/99537120225.pdf
    • https://marljivo.hr/userfiles/file/wiwadejapemawejike.pdf
    • 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_off0000cc4c.bin
009b517452f0ce9b81325c61f1dbf899f086ec6693cf09c178b7dc0fa2406064
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4C 11344 bytes
font_01_sfnt_off0000e6e0.bin
41c012fce9947c6a8030c850f24fd53cbb6f41f1bd971d12b4dc607f6284d7a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E0 16600 bytes
font_02_sfnt_off00011210.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11210 16792 bytes