Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d36b1e235424e59…

MALICIOUS

PDF

91.3 KB Created: 2021-09-07 06:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c7bdf76ff3c711de3d0d54df32eaa0bf SHA-1: 06d7645cb0ba2243bacfa1840f94663b498ec161 SHA-256: 9d36b1e235424e59edd48f791706d6e64da897733fca9afc64f19fe237a237c2
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a phishing or credential harvesting scheme, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://sagarexpress.com/userfiles/file/59884248497.pdf In PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/98914fb1d1d8fef72b1f154bc3ba2dc8/nopobirig.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/7636d0ee74ea30f047660d4ec8d5995d/sitadorovofaxokofa.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/nebeva.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/89742994585.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160adcaa8c38b0---wobikowodijegoboweneki.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/tosavafejuvi.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/navoduxolasobimarenil.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/86662739087.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f77900602a---10428836900.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e48ff6a5d0---junavim.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc703beef2---wapafena.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/b8294485382cdb1bc801f2867112bdff/20126279052.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210716_154607_2211.pdfIn PDF document text
    • https://aedwea.com/upload/foto/sazakofesozafezexivejiv.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609762b79878f---wubekukosivunawupesilifid.pdfIn PDF document text
    • http://cauthinh.com/luutru/files/1277394530.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/78052993480.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfdb5ce305---6295747899.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/xidepekufuwajinugobupamom.pdfIn PDF document text
    • http://ledesmasportsmedicinesavannahcentury.com/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/36750497217.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607224d5d2bcc---20520328804.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bb471f16b---lujagewigoje.pdfPDF link annotation
    • http://top-conversion.ru/ckfinder/userfiles/files/perijago.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/3bcd1ca03b97bc43d7a20ebe29c3053d/36698497106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=refund+by+fritz+karinthy+summary+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_off0000fbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC0 11148 bytes
SHA-256: d4a68ecdb9d1ddefb4152a2b444e5fec8406964284898a7d0d68fc2d5b22d823
font_01_sfnt_off00011577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D89 19068 bytes
SHA-256: 2db7dbeb9bea520cc1b7801468f770c41aa8f22aec01c30a87929b9567a13bd6

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