Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53d6760a07ade7b…

MALICIOUS

PDF

81.6 KB Created: 2021-08-05 03:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 778a84b42c132ceca4ce6d1bc14c40fb SHA-1: b933914722aeb1806c9649689c7d9d6e891e833d SHA-256: d53d6760a07ade7bec478769274f7b8a51893266a21c27e494e3e84fbcad4ac6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://maimungkorn.com/UserFiles/file/8786879794.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b19ccbc79---31900582318.pdf
    • http://phdpecs.hu/userfiles/files/90136934684.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/67cba4f46318d09e0b050b7701380c15/sesulifobewod.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/6aa65b54ae8754d46ed56051bed60b0b/15135446422.pdf
    • http://cn-polylysine.com/d/files/10088702788.pdf
    • https://hogies.com/includes/template/uploads/file/sagalimarig.pdf
    • http://bawaconstructions.com/editorData/file/pefabu.pdf
    • http://forter.vn/hinhanh/file/bitawepuvesewivogobu.pdf
    • https://madopin.com/calisma2/files/uploads/27755035051.pdf
    • https://agatanorek.com/files/file/jokarudo.pdf
    • http://nusratali.com/userfiles/files/87189776728.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5f056f86d---88005767200.pdf
    • http://dancephoto.ru/userfiles/files/mikutatiwapafenota.pdf
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/25262387837.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a3d92cc8c---vifisisuwevopigu.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608dafed6bac1---12725164517.pdf
    • http://mousike.it/img_ins/files/45359381363.pdf
    • http://www.leposeur.fr/site/upload/ckfinder/files/4665751907.pdf
    • https://hbfilm.ca/resimler/files/sofiratipogasudezefa.pdf
    • https://apsco.ly/userfiles/files/tizapago.pdf
    • https://aksukartela.com/images_upload/files/52801435349.pdf
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/gusix.pdf
    • https://penzion-pod-rozhlednou.cz/img/file/45012513345.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ff920f775---21899159239.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=rehna+tu+pal+pal+dil+ke+paas+mp3+ringtone+download+female
    • 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_off0000d770.bin
55f663f7d441bf206fdacc1817f2fc5df5586e81220cc193d009d03afd7d659d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD770 17100 bytes
font_01_sfnt_off00010476.bin
aff8fd46b0eccf6b3f455a8653ddaef8b0adaef070ed470ed84d85e67a635360
pdf-font-stream PDF embedded font (sfnt) at offset 0x10476 11440 bytes
font_02_sfnt_off00011f25.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F25 16792 bytes