Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4bc729bcf8bc44d…

MALICIOUS

PDF

87.4 KB Created: 2021-07-17 05:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e6f54553acf969c51e8127d284eccf65 SHA-1: d5e31b42b4db2cb8758dbcfd64022dd30435b7c8 SHA-256: d4bc729bcf8bc44d2d1d6ecc6dc21bb95b07a64b7d0a442ce858a29ecbec3dee
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing content, further supporting its role as a malicious container.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bishopsalamatkhokhar.org/userfiles/file/pigamitob.pdf In PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/75927001742.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dae1c0bc44---14959369603.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/16940774617.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/58351023724.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/pudojimixotetajekafok.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad34158407---kibiwazudurukukiko.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/775ea9d6781de64534af3989d5a534ac/62572505453.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/1886a85a69698703d5455cc1f058d116/22551225237.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/43192234754.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/43512195110.pdfIn PDF document text
    • https://promise-land.com/upload/file/55394516262.pdfIn PDF document text
    • http://terminsk.by/pics/files/7820498488.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/odk3ilqjq4rvb1mhpta9hjegr6/kagubefa.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38c3e71f44---49207065352.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a38684d4c---16200675933.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/74898945232.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ae74371c1---46536597020.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/24350453868.pdfIn PDF document text
    • https://luminex.pl/upload/file/ruwokeviruwewazugavan.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/lorifinabaxikalitimita.pdfIn PDF document text
    • http://gamedunyasi.com/calisma2/files/uploads/nonenapekukugawakigagipuw.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/3rm54j6q0o9l38u4dt4d1h4h13/51979318612.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/dobonujiloparuziluz.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/d3rsalurifqt5ejg5aj6cqb9eq/juwitobogebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=late+puberty+in+boysPDF 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_off0000f406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1D 10508 bytes
SHA-256: 270934299efc117a0e7140fb0cecaa5df146f07687e62d3d4cdc58a447ca2af8
font_02_sfnt_off000123f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F9 17216 bytes
SHA-256: 59033eda54c98e3e3f0680a234ae1f974cade125b22f24e564ea5a5c4889e860

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