Malicious PDF — malware analysis report

Static analysis result for SHA-256 acdf82cf78b8cc4d…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 00:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 50805e7c6033a4ff8cb29f10ba7bad66 SHA-1: 643e08d92c5556600b5f810ace4345271dbf8e46 SHA-256: acdf82cf78b8cc4d0f274c0cf094d64beb5c3125c0177220d46be4a743a67512
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://crewmak.ru/uplcv?utm_term=secador+taiff+tourmaline+ion+cer%C3%A2mica+2000w+manual PDF link annotation
    • http://hutergroup.de/userfiles/file/tujamuzarisa.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/53642739137.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/wurazofubitel.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/49425715337.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/r6t80vdnntd52oa0sl63vbqogc/98687585481.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/59699313966.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/4nsqka4vv0tf19ganptvi3s47j/zutodimofezuxefilafas.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/belivumukeralirosegorog.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612477b02ab84---30622041517.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/a65184f54f68e574a4d87ed2c4e396cb/95901199191.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/vuxazizorolikifojuzovudop.pdfIn PDF document text
    • https://fishboat.hr/files/tepubirojoluw.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/37042384751.pdfIn PDF document text
    • https://digireg.at/upload/xawimexirakotewebixuki.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16109e4004eeb1---31763219728.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wilekobavovelojex.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/mepazutagikapusepe.pdfIn PDF document text
    • http://ledins.lv/cms/file/sebitutinuwavikal.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/pabomagidoto.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a88100ce480---94896983543.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/96523862867.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/milasokajalat.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/65532867060.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/52597021538.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c452f9a679---xebitibi.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700fdc9d27f---mutifuwuv.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941c7a9af02---mizobudakulodafode.pdfIn PDF document text
    • 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_off0000d849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD849 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05B 18032 bytes
SHA-256: 3a778ec780c9cc5b73ff343a6856ba3a41e8e72a744e80b2723c89961954dc33
font_02_sfnt_off00011edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDD 11160 bytes
SHA-256: 4b66d7e33a186840cb761c3cd82f2dfdf1344582fcd9a24167443c4476263dd5

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