Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1cec1de129b7230…

MALICIOUS

PDF

74.7 KB Created: 2021-09-14 14:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d44e5845ee3ce18e9d0e3368be73bfe SHA-1: 1129f7deb3c57b9022df2b9f1fd5ce4e7d4bbe54 SHA-256: c1cec1de129b7230abc7263b3796919673efd4540b9dd42b2e8450fec7339a56
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. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The primary purpose appears to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://unseretochter.com/images/file/mupuxuxogezofu.pdf In PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16132ec11a73d1---77323093456.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/wobunovibor.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/6302101846.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/nofebefogudanokuga.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/lewimibixe.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/penofunizibizigakoxid.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/lonikadibiladuguzefenugab.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/wuxokonatujizobetapeko.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/wozerero.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/busewejevebobutapivuzas.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/saduxutarigisowubu.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/963502383.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/99722686344.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/29849978482.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/gejur.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/93896323488.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/panunejep.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/fasewogopaxarol.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/xejelofenolopelonarudinib.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16135a624cf89a---9296039862.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/22982476773.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135cec014f90---notoviragosekikoruwadi.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/japedekokiwusenofedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=nokia+pc+suite+for+macbook+pro+free+downloadPDF 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_off0000bf55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF55 11176 bytes
SHA-256: 9c5276a9d83cba9114124efc5d4c97e980a7d7f74223fbfe334b5f162c379385
font_01_sfnt_off0000d956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD956 16936 bytes
SHA-256: 7f8c49b3a4cecde2a95e65ea1c9f9119e5ba27ff4974103d7b5980ecd582c87e
font_02_sfnt_off0001052e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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