Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d83385a7748fa4…

MALICIOUS

PDF

73.9 KB Created: 2021-07-04 02:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5fd0cb203ace7371921a7acc221fe42 SHA-1: 40d118ad25fc620b30e0df7193539b9eea6da086 SHA-256: d8d83385a7748fa48fa55ce67c58e43315a1d830ea8608aa62933d132ac31d42
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised or disposable domains, likely intended to lure users into phishing sites or download further malware. The presence of multiple PDF link farm heuristics and the ML detection strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://samarpanbharat.org/trila/userfiles/file/32074330896.pdf
    • https://oumkua.com/userfiles/file/47803351514.pdf
    • http://fly.no1-yes.com/userfiles/file/kazum.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/2887bebb7f884c9939880c1abadef27b/lareradunekepax.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d59c1b3d5---76837123306.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/ifvepji9ba11tgvrenequ0tlh9/fuvok.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084b8043b4c4---21206780514.pdf
    • http://asiadomainstore.com/userfiles/file/kamimivimituzatamisunob.pdf
    • https://aplusadvance.com/naver_editor/data/file/19660916551.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1b1a1c42389148ff41c1151c6cc84a7e/93884733423.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd20d33d53---muwupavulevikegumote.pdf
    • http://maychamsocda.vn/images/userfiles/file/xijokazogodo.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16090344366b39---58975048822.pdf
    • https://udruga-invalida.hr/files/77761767361.pdf
    • http://flagrant-desir.com/userfiles/file/wogupalazoli.pdf
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/25416849597.pdf
    • http://mtecommerce.it/public/news/file/lupegox.pdf
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/julugetepijijovafa.pdf
    • https://agentcctv.com/userfiles/file/mufudet.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/1gb9jmt3l8ebqju9bnnq31egib/9359772338.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b35ae706b---6976294804.pdf
    • http://clear-es.net/yamituki-n/uploads/files/46701770272.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/984d0550b0ab3eab71b94089300daad8/jagiwenakuvafirutolotezu.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/tnt8qmsea77mj2femqfrulj41b/dudodudo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=4+months+from+today
    • 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_off0000bcdd.bin
ed9e20618f3ca61b87ca655fdf197f3e923e235a3b6f4106f8e91ace902b31de
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDD 17076 bytes
font_01_sfnt_off0000e9a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A0 16792 bytes
font_02_sfnt_off000101b7.bin
55d1a1c2d7b574e078668c80b2ea49451d53c6e7ed82eea89806db4997121242
pdf-font-stream PDF embedded font (sfnt) at offset 0x101B7 10444 bytes