Malicious PDF — malware analysis report

Static analysis result for SHA-256 e06c63d6565d02ba…

MALICIOUS

PDF

89.9 KB Created: 2021-09-17 13:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8ea3ac2fbe68c63c1c1ea4fe550091d SHA-1: 9b60cc71f38e79fe6919f2b0a3cf83febeaf4b02 SHA-256: e06c63d6565d02ba51d6c39d0119cc65d9974d752bad98f69757a47756103634
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external URIs and links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9777

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://philabc.ru/uplcv?utm_term=4k+hd+live+wallpaper+download PDF link annotation
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161379c311fbb0---4477425630.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/famajuluvawudinokawotog.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f84a5a4802---belodozebebekazefeb.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/kikenixidifojagolo.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614041b37de7d---sonegebatobepegu.pdfIn PDF document text
    • https://pqclass.kr/imgs/file/38589651111.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/gumepot.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/6f80636a14a2aeca97552da00e2ac4b9/kitinogegotapuroxofa.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/64097325603.pdfIn PDF document text
    • http://vo23.ru/upload/file/suduwakum.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/keduk.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/ruvokonuwimumikibewurezuk.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/volofota.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202193131884829.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140b97ef1116---12192607222.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/kabupapeviku.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/dezikagese.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/35089899995.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/lutefifezejokelotumo.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/22999825294.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/mapeginumelebitusidex.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/161364b959234d---84028406122.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130fa5046315---77026460086.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210913032016.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/libonasojuxiroxetap.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/moxuporutoxulej.pdfIn PDF document text
    • http://savemaxint.com/files/file/pikelemafugerex.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012227.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12227 18424 bytes
SHA-256: b2cd103a7d6035781297063cf8f5d248d81cc31bbfbe9f4606fa5f553d51db1e
font_00_sfnt_off0000db36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB36 18012 bytes
SHA-256: 11e8f0280042e66dda1d51cbb7a747545873c8eb7c9e7b6ef363837cef84dd3e
font_01_sfnt_off00010a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8A 10448 bytes
SHA-256: 33a23bbe35814f9a3788600b55eca1099c2101a7fbc3d8f18f76835300fd7c22
font_03_sfnt_off00013f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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