Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2096e504d25e5f4…

MALICIOUS

PDF

80.3 KB Created: 2021-07-25 20:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 45cf13e6295ea4e51e090c5da6eea92f SHA-1: 0b9bbb22a0e52c2cd63bd6e47b4ece2dd750126b SHA-256: d2096e504d25e5f4dbc9fdd83afbf65e482c1d3285fac8510b728d44b7b2a603
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm pointing to multiple compromised CMS upload directories and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cadeco.com/testingsites/advantage_aviation/assets/media/file/39797356384.pdf In PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb395a97720---zexunebifedogalikerivu.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/46122878790.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/wobewubotivudaxofivif.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/frtiqh9osueq6sdignrife2i6d/jazuvewobere.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846a6d4a144---lamimivokaxolufofav.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/jatexadisum.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/396f78027b886fd9d21f2ccddba97233/26716561721.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/kiwemevopavudonamovibewu.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/pozevitajo.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/xalexovaroxima.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/4lro5qdm7isf62ruetks6jtt03/buwitudukixijegosid.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/dudokafutarazux.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/ketuxowopadililupa.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/49d83085aefea65023cb2bcccdee6e3b/paxekipunedibi.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e022bd7aa87---9904878335.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/73504369127.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/42055366438.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/hj24ucoudevnkmvqk0omq7pon5/49801836350.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/21134789686.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1fbe3d71c---napalubixodoxonalib.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/fewojimedoxozoxibowe.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/dunibefakuja.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a7965190f---68681949569.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b503e9bf9e3---misebuluxepojon.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/1eca5efe00e3cb0a4357052c22cba676/63363234916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=reported+questions+and+imperatives+exercises+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_off0000d3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CC 16936 bytes
SHA-256: a8af7770d8e232120880ff9426834ab68c2aed7db9e53968d84ef130fd2208c9
font_01_sfnt_off00010024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001183b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183B 11196 bytes
SHA-256: ca399973dd388d92d14e137ea06b1ac853fe49b7cb23647a081f0ff56f22c985