Malicious PDF — malware analysis report

Static analysis result for SHA-256 955d201dee7b2f0d…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 04:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d26010c8830134a2ff5621aceb9664cd SHA-1: eb9a195cd8183b636bcd1995cf8ae2be1b2bbada SHA-256: 955d201dee7b2f0dc7b376a931f67a719ba5a5906c5930e116ee986803402923
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The embedded URLs and the nature of the heuristics suggest an attempt to direct users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.domosystem.gr/ckfinder/userfiles/files/nesonemeruzinik.pdf In PDF document text
    • http://kapsalonvogue.nl/files/file/birotuditujaxadapiga.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/gikukuteko.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/63742597763.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136e78f0c533---6061978281.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/gigakewoxakuletuma.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/de89e8d68ff290cec4c20d86e2ad9ce1/worinosirugeretilo.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161394d825b556---samokadaxijazawupojigu.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/3542101662.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/12457842114.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/wobukamifudinamifunozipes.pdfIn PDF document text
    • http://flirdining.com/uploads/files/59830467512.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/87250235226.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/35074086047.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/86972797347.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ced0a1141---94296177630.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090518060394.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/rodubodirotazak.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/famoti.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/32569067672.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/1mf6r15lgvi1n2dtstmqprjf4i/bigezege.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/zexojigekom.pdfIn PDF document text
    • http://medigroupvn.com/upload/files/86098082313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=lord+of+the+rings+1978+watch+onlinePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C0 18040 bytes
SHA-256: b7326a1f5f66ff90890957267e289137a811b11c615c24b900a142e66ad0826d
font_01_sfnt_off00011045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11045 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001285c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285C 11276 bytes
SHA-256: ad3e375d5c42bd547636966295d636cf2534d14b112c1bcc69e45444b33b61a2