Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8f0fb50b2f2618…

MALICIOUS

PDF

99.0 KB Created: 2021-09-01 22:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2ba9c87025cd4fb50bc92d6564f3e8cb SHA-1: 1eca0f11e40f58b3602baa236d3124949e82f327 SHA-256: 2d8f0fb50b2f26183ebd12747da9b0447172f37ed4339b894a075f76242bf119
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to external websites, including those hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/lalexadimejukuvusobugu.pdf In PDF document text
    • https://stopserv.ru/files/file/pojirapaxemizejovejid.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/6183624027.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/rudore.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210811_E75013125C3CFE50.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/tabunedixadevokij.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/70525979963.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/43404484884.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/riwureman.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d3189a768---xixekigor.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/43afa5f84c61d40ff12525e7e457da0f/92208476594.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f17e4e467---pagasifibefikos.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/39671864936.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/41204478901.pdfIn PDF document text
    • https://stauber.lt/images/files/fasavarigigad.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/datadidejotamotuwozuk.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/gemexidu.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/22444612715.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/78670203728.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/81681366336.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/c866f139f722bfe3723f604d62664df2/sumitaromu.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/zefusaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=area+meaning+in+mathPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001262a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262A 21732 bytes
SHA-256: ed54d66b1d4d6b67d1bea4f7021b6cba1540c1bc266cb5d911017a3ce7c706bf
font_02_sfnt_off00015e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E00 1840 bytes
SHA-256: e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729
font_03_sfnt_off000166a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166A8 10204 bytes
SHA-256: c29e1f5c24a1791598b7e63bd1aa2c647952eb6f019ff6fc1d393d3678716023

Open this report in the interactive analyzer, or submit your own file for analysis.