Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a67652b7cc3abb…

MALICIOUS

PDF

113.4 KB Created: 2021-09-04 21:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fda44e9d0e37198e9c40c8c81127de46 SHA-1: 75c1e4746c9dc803866905d168647a9663ae38f4 SHA-256: d1a67652b7cc3abbb93c219af25dc3df4d5a8ade5ae89220ffd2e40c90b0bcb2
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, characteristic of a link farm used for SEO poisoning or phishing lures. The presence of multiple external URIs and a link farm structure suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://studiomanzetti.it/userfiles/files/notubanovelakuvig.pdf In PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8668379da---tuvejutivoguxojep.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/d71c99ac2c347a6bd31cfb9917251c7c/zejozusek.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/vogixumibu.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a57bc0dbbd9---mated.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/wusubavimesat.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/xivuxudagazenemewefilalo.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/2056c8efa941c1fad028fa6f3197fb60/54578120780.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/94672438405.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/52dbd02ecfabe9b72be9ce6f4ce93200/konene.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/rifalaxujuxedilu.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cb8ab309b---watexunedobunuzubadiboj.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/xubevodevi.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f865f2176---42768207697.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/28143874551.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/bac57b26f69fe9aa23b254d714daf620/29951464848.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/2vsnv5vcj6jfvnol0thq4rh631/senuj.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/zifonowosekexebugup.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/66280322068.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/matus.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/e4689f2d9afa0c47f1899bcba37d1fa7/67121540245.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/50a2de63d83713e75d9b6ab73cb26389/xekij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=at+the+round+earth%27s+imagined+corners+pdfPDF 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_off00015261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15261 19268 bytes
SHA-256: 030257170d0bf556e3971bd8a4df39f90d83fbc3d763f67abbe39d8cca54a974
font_01_sfnt_off0001845b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1845B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C72 11136 bytes
SHA-256: 9620e5415dde9f26bc851f483dce80d0a56264a3c097180832306f72bef1d588

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