Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc8cdbbb8371066…

MALICIOUS

PDF

75.0 KB Created: 2021-08-28 06:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d73092eb6caec060002dc3aa5933c015 SHA-1: 0d3864ee1f7fece675c83c67530489c16f3ec8bd SHA-256: 0cc8cdbbb837106615043d38994d3bafb83ec3db0a3238883db993caeb87846b
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crewmak.ru/uplcv?utm_term=spss+interview+questions+and+answers+pdf PDF link annotation
    • http://aptchasers.com/FCKeditor/userfiles/file/tikimofivikukosamo.pdfIn PDF document text
    • https://pindimana.in/uploads/file/97542632374.pdfIn PDF document text
    • http://juicewarenhuis.nl/app/webroot/files/userfiles/files/27146142270.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/jozedatirafozemururovaw.pdfIn PDF document text
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/tebazisoraxavabowegij.pdfIn PDF document text
    • http://micruts.org/userfiles/file/66821285734.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/42210373184.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/jiguwezedojufetusat.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/waser.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/d03c7d19f825a5718c15b3511f28b091/3638565492.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dc2a5c2dcb5---22656700824.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/voretiwebupu.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/16715213486.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/borimabuzopit.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9501e906b---13813401769.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb1e795835---53703578173.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/224id4pp54hrti9195car1mv62/lopexakusax.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/01eeba5dfce6449b95a1793db53e43c7/67034964498.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/puxadidebedubunapug.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/68176514830.pdfIn PDF document text
    • http://roocenter.ru/upload/file/bajegerojepumoxu.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/38401024216.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/fe89d371a74c3a1c132bb3e84fb089ff/gobuxegeridaduzib.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/7444964087.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_off0000c45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC45B 10920 bytes
SHA-256: 2c67d681060ccbf8e786cbad50e6c9026c7c959297d50e207b8903478545c6ac
font_01_sfnt_off0000dd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD97 15760 bytes
SHA-256: f4b74e044ac76c4044741f6f13754491a63fdbdfa28f09ed74d210bf7b9ba360
font_02_sfnt_off000105c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1