Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50e1f83a4829576…

MALICIOUS

PDF

88.3 KB Created: 2021-09-09 18:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eec24785a9e80e89108f2b8cf513c914 SHA-1: 3e51966855e1d5a4f5601e51ec0c83d1b7d5eb7c SHA-256: a50e1f83a48295768c3fa6d3824d5ea14f7cfbac70d251821110a39d47072f37
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, directing users to potentially malicious sites hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://xlspandoek.nl/userfiles/file/japajufiwajizitivazanos.pdf In PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/kajaxirexujojalon.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/jimolakorowodibip.pdfIn PDF document text
    • http://coachhouse.info/assets/file/ruwagisoxovu.pdfIn PDF document text
    • https://eclearusa.com/images/file/77055265231.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/pixubonujonomejum.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/48130113144.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/53235ecd236d8dbde1697b4113c00957/dupuvuruxuwekav.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/pepuwizujefamedet.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/4299244635.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/14847388963.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/81158638781.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nemapobiragamaxafa.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/filaz.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134f8f88f2df---pumobejonufosug.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/rupazijujesafute.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/vinajekatuwulofepizobax.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/matebojuweredusonavedemag.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/848630440.pdfIn PDF document text
    • http://qwerty.pl/_data/file/52129642415.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/waturolaniw.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/52770498790.pdfIn PDF document text
    • http://langmypham.com/luutru/files/82368172695.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/4e128f650075df9f45efbcc8ae53a575/91739666345.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132d58f70da5---53768423838.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/diriz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=primogem+redeem+code+genshin+impactPDF 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_off0000f190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 10916 bytes
SHA-256: de2f0980363c91da6b8a9aebf269d0c8961dd706292fed9ce2208df72fc1d5d4
font_01_sfnt_off00010a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A70 18904 bytes
SHA-256: b96158245527fc884f866f05e727fff51a03497d230a700146ea65e13996a2bb
font_02_sfnt_off00013b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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