Malicious PDF — malware analysis report

Static analysis result for SHA-256 62147ae052b3e4ef…

MALICIOUS

PDF

70.4 KB Created: 2021-09-30 16:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69068b81b02a7a83bfb7bb76635c543d SHA-1: 614097c6862eebb9a855e7530f2f09fd481cdc8e SHA-256: 62147ae052b3e4efd66f916ab2fabb6d137085aa004824531692e77a32d2db05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV. It functions as a link farm, with numerous embedded URLs pointing to external resources. Several heuristics indicate that these links are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/12070331151.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffba70f71f---remoxotusegukosop.pdf
    • http://djapm.com/userfiles/file/58512609102.pdf
    • http://actybrain-consult.com/Upload/files/69944199432.pdf
    • http://alacarte-grafik.de/userfiles/file/30762967396.pdf
    • https://insolite.lu/img/userfiles/files/radofogiki.pdf
    • https://full-e.com/app/webroot/userfiles/files/20210919_040104.pdf
    • http://stavebnevyrobky.sk/www/upload/files/nevoliwaruriv.pdf
    • http://toanthinh.vn/webroot/img/files/17665323261.pdf
    • http://bayernglobal.de/userVZ/file/91958989924.pdf
    • http://idealhca.com/admin/images/file/82662486616.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/j85vfpqakrf1igi424o60egokp/fenizimemufifi.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f62631f666---91943459543.pdf
    • http://jj-metals.com/userfiles/file/2021090922524373499.pdf
    • http://gearcon-eng.com/file_media/file_image/file/lufogobemasojuga.pdf
    • http://mzch.pl/userfiles/file/52882575845.pdf
    • http://platcometals.com/images/file/zafivuwusuredup.pdf
    • https://adesso-moosburg.de/images/file/80524315808.pdf
    • http://webbolt.fono.hu/data/editorfile/kuxadutulidor.pdf
    • http://thesciencenetwork.org/uploads/files/tejesodidusexosawidodiju.pdf
    • http://studiosantese.eu/userfiles/files/tatedipuweji.pdf
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/98478522744.pdf
    • https://kamarkosong.com/contents/files/bogusanijunumexolodo.pdf
    • http://www.hebrewforreadingcomprehension.com/content/84955551260.pdf
    • https://cingenito.ca/upload/editor/file/85715795516.pdf
    • http://swhos.com/upload/files/bavasetuzalafejero.pdf
    • http://taxplus.in/images/contentimages/files/xonilezedofamemepo.pdf
    • http://handgun.ee/media/file/dipebigoxuta.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=dnd+e5+character+creator
    • 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_off0000b382.bin
2899c4560d4a867fb767f685ecf3053369b273f0d67f4565218059cc7e6f49eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xB382 16132 bytes
font_01_sfnt_off0000dcb2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB2 16792 bytes
font_02_sfnt_off0000f4c9.bin
e9bacdcbc2e7cbe27bd98f5ada035bfbf881ee740c5de8531b95d2e5c890f889
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C9 10296 bytes