Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dddaf82885491ae…

MALICIOUS

PDF

75.4 KB Created: 2021-09-05 01:38:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6858fdfa60b1915c2d3d9861f70f31bd SHA-1: 54b5d71ea3a1a6907013726fbcc4c465a7552cbd SHA-256: 9dddaf82885491ae35b06cf61691a6c5f920b64018fdbcd7c327e0d10c478ca9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lure users to malicious content. The PDF structure and the presence of multiple external links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://jogamiskolc.hu/ckfinder/userfiles/files/80780190492.pdf In PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/4a62ea8ea9570beca9ef85a01f6402dd/24079544703.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c42e6fde7c7---dixumipoguxoti.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/24681137778.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/tutisarod.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/ee8a3d839f7977b42564beece7a9b45c/rababulimigopezoroxul.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/d585656f5c57e78ec63e5a68ce2a93c0/76789618673.pdfIn PDF document text
    • http://carszana.com/image/upload/File/ruxigine.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/13335190520.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/thhnvv71ui0vjnc631cej487d6/gumusademek.pdfIn PDF document text
    • http://xn--299akc5b432k2sev7g.com/FileData/ckfinder/files/20210708_DA5CAE1F32071AB7.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/1bd6aj2302ue5k26g8crehd7f5/pikarefijoxolavujelexo.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/kofovavojoxamusijeja.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/30748607770.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160acf52944695---ginifubebukasowim.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/88845491376.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/05cc892525938d293c63778385d9b94b/lekojavekisukem.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/tepiguvifoviwurufebaza.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b38112c856---bipakelele.pdfIn PDF document text
    • https://csodamalom.hu/files/files/kelamolususafoxoxorad.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/limozo.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/xatafenujasave.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/mirut.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608111509bdad---zopifagokozetitadalebemef.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/94331ab50c9a4a097453c02747413e15/20393590593.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/13799758988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=isotopes+of+hydrogen+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_off0000c1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B2 10540 bytes
SHA-256: a9b53aac246be49a142f1d4bad334e94a0a46a03b9451eeaa8231ffafb9ab8d6
font_01_sfnt_off0000d97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97B 17684 bytes
SHA-256: fef9eb56ac7425eb963fcaa5d627563a4c50cb82111e2c940c6474318652fd54
font_02_sfnt_off000107a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1