Malicious PDF — malware analysis report

Static analysis result for SHA-256 403a7ea228e10f81…

MALICIOUS

PDF

390.9 KB Created: 2021-07-03 02:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d885e5877ffd1d3d26068e02f9c718cd SHA-1: 52129b6ed162067b1dad2ef7e14e7ad5e99b179c SHA-256: 403a7ea228e10f8159a24bb4969c0e61444b86100cb87b21b93817c2f726db7c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a phone number. While no scripts were extracted, the presence of numerous links to potentially compromised CMS upload storage points to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8992

Heuristics 6

  • 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3289ef5c3---rikamej.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/2g5l2k9oe0dutl34bi9ndvgrmg/56860631978.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/129510ed0726d5d96a119cb76daf2b64/96632493167.pdf
    • http://placc.info/up_image/rujadisuruvodatojen.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786e9165fc9---82734143741.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b27e8667c---36124628026.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-4-29/20210429020656279818.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f635bbf136---fitusagin.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075223160c60---46366863023.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609533ee973ef---xiridoxu.pdf
    • https://stvorki.ru/files/file/55945055314.pdf
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/74679449864.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/fee85c47e292adc40a5d4a7d8c8c7ec4/61945341429.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc4622b27b---69072564454.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b41e38caee---53893865485.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f838e4a39e60f3cc00bafedfc9bab81a/zopigirutiw.pdf
    • http://think6.net/ckfinder/userfiles/files/20210702180159.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/8c5586ef89990ec5080570415f45a374/boxujuvexewajibasazimave.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608115546181c---lupif.pdf
    • http://alkanboya.com/files/file///53839779109.pdf
    • https://idd.no/ckfinder/userfiles/files/ribabiputaf.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160731796a944e---fozolurobida.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608184f33e3c6---kowavisowowumu.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608244b9bde79---wupamitopalu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=rutland+water+leicestershire
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0005a569.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A569 16792 bytes
font_01_sfnt_off0005bd80.bin
7f70470c7de1fc73704b07f79c3f07f366ef80fa1f6d59c9bb9fa54e551d4f71
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD80 10580 bytes
font_02_sfnt_off0005d596.bin
c1be33134afc8e184076eef4cf8927f91eec7e9e53b3a0cf0cc832a56ad29002
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D596 20692 bytes