Malicious PDF — malware analysis report

Static analysis result for SHA-256 9164e2536cd5b742…

MALICIOUS

PDF

75.3 KB Created: 2021-09-01 10:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c2bd8b69b39bab3fc3f41affa4a8d142 SHA-1: 1b6387d1dddedef6988f4194f8010dd7d2d69c5c SHA-256: 9164e2536cd5b742d7d8d6112aeff756a5a36fb9faff45cb4ae266424fe11872
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The presence of a 'Password-protected archive handoff' heuristic further suggests that the PDF is designed to trick the user into downloading a password-protected archive, likely containing a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=baby+egg+muffins PDF link annotation
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e7cf81cd3---memuw.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/woloxa.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/kikuwixejudekotoja.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075283049b91---68833865223.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fecfa3d4f80---tojenon.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/94599106782.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6fcb08ed0---92702265017.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/lepikagoragikofipif.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160d35a67bde60---bijavesexolalaze.pdfPDF link annotation
    • http://prabashproperties.com/ckfinder/userfiles/files/83410142277.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/22218175957.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/c815f26d1bdff539cba50fde80dcb06d/fozovowevizirirometabeji.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/71542417561.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/rurujenizetariwavuvumapal.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/71202507199.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f139300b18---23859283516.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160899f0b539b8---nabudolebidexezoturoworo.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/jemedisodat.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/97569677900.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/4975335503.pdfIn PDF document text
    • http://haus-st-otmar.ch/userfiles/files/taxav.pdfIn PDF document text
    • https://edarky.net/data/file/15759604972.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c1557c92d3---60412933808.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_off0000c4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A3 10600 bytes
SHA-256: 26a3121c9bd18ee74f776e73d26dc5bfcdb01eacf0da49aa03e7311c0ba2c615
font_01_sfnt_off0000dcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EF 16592 bytes
SHA-256: f9616253d38ca6e39fe72081882db4f831c5f2d9ca88555f79f4ea1548d8be78

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