Malicious PDF — malware analysis report

Static analysis result for SHA-256 00995cf4556322fc…

MALICIOUS

PDF

83.0 KB Created: 2021-08-16 02:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1f98ddc883a7616face48e673c0e61d9 SHA-1: 3abbd5850cf854585f5412574d28641f19db03a9 SHA-256: 00995cf4556322fc7ecf606350cd364d7b5c85b182bceff3143beb6d22609eec
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://beming.com/ressource/site-image/files/71599473455.pdf In PDF document text
    • http://its-bulgaria.bg/files/file/razutaxelog.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/gufawuve.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/74269576123.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2df2f9e393d0a705f5ba5a684c48d1a0/81993077942.pdfIn PDF document text
    • http://mosjob.ru/images/file/netovewezagiweve.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160958eb78a871---9470297746.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/zonor.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/ginagexevasegovamo.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/loxipazekuvoxabixatu.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd68329177---mamalela.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/7d81e0bd3a477ed8990e1247e195f170/muvuxaweweneniwa.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6eda37a203---96145464146.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/7400722785.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/a778447970770ba3da0ba8e84bfc116a/detugodinasafozid.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/1cb7ee7eb47b784890e825107e4c3f98/rozafajerasaned.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210721_204434.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/dja6q3beldaq4klimmk0db3o97/23738590219.pdfIn PDF document text
    • https://bataretak.com/img/files/file/45860315082.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160798e20c6579---nitasaxop.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/nopedugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=list+of+irregular+verbs+with+present+tense+past+tense+and+past+participle+pdfPDF link annotation
    • https://lapdonline.org/file/meregowulipenage.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 16844 bytes
SHA-256: 85d372d1fdef29c40d7feadde56e0ddb5facb04211726d0b524e63feddf53c14
font_02_sfnt_off000122a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A1 11248 bytes
SHA-256: c91f72fe33468779f1140e92994c503a9fbae6cc30d8dfd2cfb0cee3928b90bc

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