Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2c09fc91f1075b8…

MALICIOUS

PDF

74.1 KB Created: 2021-09-07 04:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5214b40950fe0b786e69b492e9662484 SHA-1: 15b615c848da1f4001a44b0f840426b24d303c62 SHA-256: e2c09fc91f1075b8e51bb2f2db9fd311ee1264a49895b358317dca782f7d7da2
156 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. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites, which is a common tactic for phishing or malware distribution. The presence of numerous unknown URLs suggests an attempt to obfuscate the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://e-sportis.com/images/upload/vevuditazefakuboxesijimew.pdf In PDF document text
    • http://www.northern-japan.com/image/upload/File/7007420611.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/78ade323ebdbe61623639895a2d8f9cf/vozemipavosep.pdfIn PDF document text
    • https://airbays.com/userfiles/file/kilijimorutezod.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608af228bdef9---58247971287.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/92502751713.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/sunuzogefabivupufu.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a063c06f177---10309725224.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/f3f2abfa4730c05cbbee3fe24aace577/8624410440.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/pisutugerariruwajekobo.pdfIn PDF document text
    • http://ux-school.ru/files/files/mumeri.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/muromet.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/30576262665.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/69810c40d3c58444d79455df3b1b65bf/xejedusodunaf.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/foxalibasirusosopugojenu.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021061404240173499.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/bitasoguxelufimupetuxaso.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/dujobed.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/8605317d3c5eef1329598b198911533f/dovibanulazafutusugobumew.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/mjoq8st7bv6odvoatkitms76mn/2527045494.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3930281fa9---bedadubul.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/76014725364.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/c1cb631d09c44e9cfef986d85a3c8ef2/9879364907.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16076b24250e7a---winiviwerebegedujoduxejad.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078ca66485f6---21205429848.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f581180363d---bupid.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/5259292034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=nutritional+importance+of+carbohydrates+pdfPDF 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_off0000bfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEE 11216 bytes
SHA-256: b2ba87c077c8e2fbd596b0b328ab93631967d36a43aa9d4efb0dcd1fdcc78186
font_01_sfnt_off0000d9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E1 15976 bytes
SHA-256: 50dbca059f249c55dcd67529c45fcc0cb94201a0fb32a635950039c9b39d5d15