Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a337690556ea092…

MALICIOUS

PDF

80.5 KB Created: 2021-08-26 14:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99bf6c63d1fc664aa8ff1a91f8fc802b SHA-1: fe917c4a3f3f86ef01c42f811eed3b516fac5955 SHA-256: 9a337690556ea092531adbb74d97a8fab84ecc3af0fd5d867d4f857024bf78ac
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of embedded URLs pointing to various domains, many of which appear to be associated with compromised CMS uploads or disposable hosting. The document's structure suggests it functions as a link farm, likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://catamma.ru/uplcv?utm_term=review+questions+for+mri+pdf
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/tojugi.pdf
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/6177281234.pdf
    • http://chiengthai.com/file_media/file_image/file/45902261349.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160be8d8fd9b96---bozaritunisofaxirita.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160c552aee595d---65926162983.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa1cd75c76---47116309908.pdf
    • https://ph2020.org/FCKeditor/file/getajaredubowababa.pdf
    • https://trouver-une-ssii.com/img/pics/files/50920414088.pdf
    • http://yotlist.com/uniformkontakt/userfiles/image/files/33592927436.pdf
    • https://alihuata.com/userfiles/file/panoxokifaba.pdf
    • https://masukpt1.com/contents//files/67423419705.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/a2538d0bae19484e09c8903dfc54c559/subiroxovoneteged.pdf
    • http://englandmatchshirts.com/assets/file/xorotetaposeminowebol.pdf
    • http://nscenter.cn/upload/files/55084804784.pdf
    • https://isosklo.cz./uploads/keparaperixaze.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30cab564a3---59042558884.pdf
    • http://jinanxintiandi.com/userfiles/files/91879981057.pdf
    • http://colantuono.it/userfiles/files/xitogido.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/krf8v7flteh25vtaskt62c64e3/27899337888.pdf
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/tisof.pdf
    • http://jumpstart.mobi/ckfinder/userfiles/files/28549191140.pdf
    • http://sbnjl.com/userfiles/files/26723253944.pdf
    • http://weberstellen.ch/userfiles/file/7960908786.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9c75e06b6---rajavawe.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c354.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC354 16792 bytes
font_01_sfnt_off0000db6b.bin
633b8a724b7587f810b1b2bf2a529a75f857291c0fcd751ba994610d8f9b9d73
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6B 10896 bytes
font_02_sfnt_off0000f479.bin
464bf0fe5584d63b2641e08430694a7e70f7a4f9e6e96829e2e516e3014f7b69
pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 16468 bytes
font_03_sfnt_off00011eec.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEC 16092 bytes