Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c1303c2d3024ce…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 08:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9c1012108c15083bc5e91413cc9cb8c SHA-1: de45e02e1cc25cd8af4823e4cde09f49abcecf3d SHA-256: 78c1303c2d3024ce4a282723ec624135bd3354a782f92b934f6f30ea15cac807
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various websites, many of which appear to be compromised. The primary purpose seems to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/97902112900.pdf
    • http://reelproductionshd.com/userfiles/file/7309260190.pdf
    • http://greaterdeliveranceministries1.com/clients/61527/File/milajubuvedajewezadu.pdf
    • http://luchetti.it/userfiles/files/xobajilovejobaxib.pdf
    • http://peaceinsrilanka.lk/userfiles/file/3371983182.pdf
    • http://harryreichert.de/uploaded_pics/News/file/kudurevefizamileno.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/2b4142d23722d4c79a13e51624a0b72f/sobuverevizimivivup.pdf
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/51510672413.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c5cf8672b1---69487025441.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7bccb219a---tezixopi.pdf
    • https://plasy.com/uploads/file/jefazefe.pdf
    • http://dailythang.com/userfiles/files/30472638727.pdf
    • https://celebicatering.com/upload/ckfinder/files/nufexiribesujobetibedazox.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/51ff8a607f90bc54a67a74e1ff222141/16148617608.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/f2b7afe5565de32d52e0ff4ffd6631fb/ladom.pdf
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/femavowivaximuve.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0528333f2f---nipelepifisisibig.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca5bd6c0c---rejojamilupefit.pdf
    • https://stillwaiting.org/userfiles/file/49144960769.pdf
    • http://avvocato-callegaro.it/public/file/89933101026.pdf
    • http://roletyhanarol.pl/files/file/bawagukekuwemofadasat.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/b7028cd8867191b2a73e99f3be90d01c/83039169743.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/8o51ljqb6n5c5plp8d3s1b5n5t/vutiposozawusewadosaxu.pdf
    • http://alvitraders.com/files/mogigusivotoni.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=private+limited+company+law+in+ethiopia+pdf
    • 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_off0000d267.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD267 16792 bytes
font_01_sfnt_off0000ea79.bin
7388201de18bcb75af3a3da117c4f49dbded96042b00948411e2158d17f462c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA79 17596 bytes
font_02_sfnt_off0001179b.bin
5baf33a326df3ef347064e437e2d772c4d96eb80538201ce4b788af8293255de
pdf-font-stream PDF embedded font (sfnt) at offset 0x1179B 10984 bytes