Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71c593a49820756…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 00:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 90e51e0c88c93132f6144c407493d60b SHA-1: 0bcb7c8d24c5d8216411860c3ff54b1ad2a479e7 SHA-256: a71c593a49820756f2603f9d1196f3dc80649826ce108bee90e95fe709172e2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the PDF structure itself is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://inwebjor.ru/uplcv?utm_term=zoogeography+notes+pdf PDF link annotation
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746894dfa64---36107758470.pdfIn PDF document text
    • http://someteme.com/archivos/_20210628210956.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/majuxelages.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/natogofawoko.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160af2fdd8e71f---67449212567.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/55574595812.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/50587009143.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/98285060248.pdfIn PDF document text
    • http://riversedgefm.com/files/file/64311395674.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b65052cbdc7---42816287197.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160963ae45fe74---zepemegagifub.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/faa900294f203ad1b104f147a4f3143e/26426918634.pdfIn PDF document text
    • http://teifsepahan.com/files/file/57959895169.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/1332136861.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/81043794543.pdfIn PDF document text
    • https://rumusjitu.com/contents//files/tijeg.pdfIn PDF document text
    • https://unitjaya.com/contents/files/xikababajomejaxoda.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a7941145c36cc04a1f85acb2bb1b7200/67458584949.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/dtadqopb8fh886nufm17tiut21/9628659569.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e3dd1d52f---fukifevujelalasek.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609682c14d032---zuxawuritepevupesuzil.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/baforofedal.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/doviworiwideg.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_off0000df50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF50 17500 bytes
SHA-256: 5a0539dfd3b2d558cb810bec1012b7346fb22f48a66f67c9c56554d740fca04d
font_01_sfnt_off00010c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C39 10716 bytes
SHA-256: 0d6478a29fbde5117695edcf89213f8fa779f72fec07368a3a1be0ccffac5598
font_02_sfnt_off000124a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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