Malicious PDF — malware analysis report

Static analysis result for SHA-256 eab886fa307fe421…

MALICIOUS

PDF

100.5 KB Created: 2021-09-05 10:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e8b7cf1c6fbb5e8fb81aa9b3c799f61e SHA-1: ad8be8b717a5eafbdcc240bc87873bb415a5c935 SHA-256: eab886fa307fe421060b09c3a4e39db70dfde93d4345de29db47359fa9771768
156 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://vildmarksjagt.dk/userfiles/file/kawuxarofabedetolerazam.pdf In PDF document text
    • http://carzip.biz/files/uploads/files/lizebubakawulopunusetupem.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/nopaxazodagopapape.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/vutagelarebedubeta.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/dukulivonitifen.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a04e1b54a9c---livolosutoresarot.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/31497517410.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/44361560977.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f9fae355a---23364665423.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/nopusajavunoxegojolivav.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210618065815_gzp42r.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/66492057538.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/71904941744.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/73618597478.pdfIn PDF document text
    • https://music-group-store.com/upload/files/xawetubogarijevemu.pdfIn PDF document text
    • http://polletnv.be/uploads/files/tafagapitisoropaxoxopelow.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/36274959d8c535940f10ada565b93857/tonaganepa.pdfIn PDF document text
    • http://pbsdeltarho50events.org/clients/d/dc/dc3fcb918f61c9276c5829b035df2abc/File/45531363954.pdfIn PDF document text
    • https://noddy.nu/images/file/pobepirojop.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/vizosubejesifuravidubuvof.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/79449981536.pdfIn PDF document text
    • http://veitali.com/upload/files/gagajosogi.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/jegadakivakidij.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/xuxaniwugoniv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=internet+of+things+pdf+2016PDF 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_off0001216a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216A 10980 bytes
SHA-256: 322473b7c816c7cc898f0b21e66d4f696aa866b1eedbdcf9cd222b0563f43d35
font_01_sfnt_off00013aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAD 19072 bytes
SHA-256: ffc32ba9874836c86ca0cc4484c4b57d528f88c1fa9924e80ed51cbc8730d785
font_02_sfnt_off00016c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1