Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b436ec3517c0914…

MALICIOUS

PDF

75.4 KB Created: 2021-07-23 03:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 659a905b855a17d22ad631574a8966d4 SHA-1: b28e114c7e94c929518e999e7571d1e44a456a3e SHA-256: 6b436ec3517c0914a0b58964a8c1a60629356994a111121de7be5cca4284d1e7
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to link farms hosted on compromised WordPress sites. These links likely serve as lures for phishing or to download further malicious payloads, aligning with common tactics for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ndn9lhg2623hnonc2kct8f0usg/28008325090.pdf In PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ae43fc58c7e---fapuluferoxufofimerurari.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/60573506668.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/58cb8fd2d2add4ef32841517ce6f8470/pumizevafisawakawerute.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/60459672942.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/82976363972.pdfIn PDF document text
    • https://saam.vn/images/content/file/70343912431.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/16932010914.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/3bdfeb5bbd496e5257942f6216d45c2e/ritamomofexujobikivikaf.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/76670407481.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f94266fbd---futudiziti.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d00bfbb3429---56165527172.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34bb35e75---75027316789.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702e59ba57a---65489708631.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/salutopo.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/likujab.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b0d58c7e6---72157677564.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/e747a3e9ecc4e8ce786a7f6d3753140e/nazodoxufenufugis.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/misulugewuropo.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/63745307459.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/pizosivefebetotilo.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/fanonigubadenekerogaput.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/70523789850.pdfIn PDF document text
    • https://airshow-bg.com/file/31727064168.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=gravity+falls+on+piano+easyPDF 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_off0000c599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAB 15784 bytes
SHA-256: 2e69adcd734452dcbec15d440939b25636203b85ab2010437133d69830ec006e
font_02_sfnt_off00010631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10631 10572 bytes
SHA-256: 12e1187b1ae7d4e1491e8ed8279d927f45cf9505de061ff2c9590f2b6e418e38

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