Malicious PDF — malware analysis report

Static analysis result for SHA-256 94d4dfa8a7406379…

MALICIOUS

PDF

89.0 KB Created: 2021-09-06 04:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 96a3a6c7c3a3d1c8dbd9b993e3cad493 SHA-1: f0c8d42574e93f7ac3566118c017d473b8387300 SHA-256: 94d4dfa8a7406379309b14de402d9e46dbc0fbfb588e4953de90c8f58c758dc0
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to other PDF documents, many hosted on potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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.
  • 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 http://taiwangallant.com/uploads/files/202108201348346482.pdf In PDF document text
    • http://cutyoursupport.com/userfiles/file/niwidufa.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/tebezarifarimolijozisifu.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/89463029268.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c415414cd---2599738144.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/cu9gfasvnu80hkihrhve1mhfa2/13063047096.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/24139311767.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/8334986300.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/lufipinitubilapitaxafuvi.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/73560768748.pdfIn PDF document text
    • https://fuoriscena.eu/file/jelavamukipavexiludese.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16113bbed58788---lumalave.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/46197595526.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8d325b32b---mijadave.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d5972e0f---50258826998.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/51436578637.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/kalafaxipokujezojo.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/39544922353.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/defunojenavamiraduzi.pdfIn PDF document text
    • http://dsagco.com/Upload/file/zimidumujobakid.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/3oc8tbqsm6qn7phlhelc4nj03q/67715835082.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/roxijuvigopagarudexejefi.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/u7tl674eh58290ltc6im2t9hu6/pitiwexaxuzewatasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=excel+center+worksheet+horizontallyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000105ef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x105EF 19208 bytes
SHA-256: b70251d6641496381b6e277ca0a6d1836530a53d14ba55cac1b54e142369d441
font_00_sfnt_off0000d752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD752 18080 bytes
SHA-256: 9b31605b3593343b6a024673f8ee1814f91e640aa5d178375b98cffba1e7dad1
font_02_sfnt_off0001251e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251E 10764 bytes
SHA-256: 79cc70c0ba5bd8ea11b1881f73dd78804361991d851108bf3c650a1ebf18058e
font_03_sfnt_off00013e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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