Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa69b53e9214a192…

MALICIOUS

PDF

90.5 KB Created: 2021-08-14 20:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 78d10c567128c83c116f538f2cbb1477 SHA-1: fd144ec70cfc12d337761002bc2aeb462e7c0b88 SHA-256: aa69b53e9214a19258c2454ba279162f4e6ac69dc5878d28faaf924d44c0db9a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to compromised WordPress upload directories, suggesting it's designed to host and distribute malicious files. The 'SE_CALLBACK_LURE' heuristic indicates the document likely presents a fake billing or refund issue to trick users into calling a number or visiting a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • 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://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9300acf14---zolid.pdf In PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/45tk3oa8tldqqvtuggnnnlk2h7/kisilavap.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607828c65640c---18035746960.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e4e0fc10924---82821937328.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b668d79732---ditomoju.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a74a576d591---35457611988.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/15219648885.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/nuxapibolaxiwasoke.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/kopocj9ea3bdoa3c731p883qnc/64913145556.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774def62a2e---mepolobifovojata.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/japikimamodudafe.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/78024575558.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ae7126eed250a860dbba2997f9b05834/zojaxadasakonimisabi.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/16243643657.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/gukizemoze.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/41239771905.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/zudoze.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/g5sq3k3k10l5nljv2mkbnq8juu/66955536292.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/vobuworazezimugevomipubi.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/99914932015.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/1f97d6c5984a5c30397a0214b975451c/68836419696.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fbbeff8736f---jamubek.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/rumoxatu.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/196e7793d92c270043a0f3c45d36347a/69299685260.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/35380694505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=miraculous+ladybug+season+2+episode+25PDF 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_off0000f733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF733 11192 bytes
SHA-256: ae3bd8312b18876365b6fde0da273818d82c98af4ab89a6b6afa505c78a26abc
font_01_sfnt_off00011134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12946 18784 bytes
SHA-256: 89f6c489b6acb5720a8446c4734319009450ee69e559e7fcc88e11a4171a4129

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