Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f41c45e9b255831…

MALICIOUS

PDF

78.6 KB Created: 2021-09-19 07:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cb586f289af76d12cb72bc5f4c8c6525 SHA-1: e567824c59ca8076041b716853d6ca357bef0fb5 SHA-256: 3f41c45e9b2558314cb75a4d2f6e3da7013fc600f7820fada0d95d2142004be3
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's part of a link farm, with several URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users into downloading further payloads or visiting phishing sites. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=pro+evolution+soccer+2016+psp+iso PDF link annotation
    • http://fine-trading-knotwork.com/uploads/media/32236480744.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/kibivunamim.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/sozipixorisani.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/pulalabobu.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/sakatabizobaletufowumir.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/lowepovarepugu.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/ll5epu3mu7uiin772943oashjh/totabinolavalogezemogaf.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/57742440141.pdfIn PDF document text
    • http://chipgene.com/image/files/20210917_065712.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/sijefodalifubuloju.pdfIn PDF document text
    • https://areicon.com/images/file/zotufowapawigon.pdfIn PDF document text
    • http://vit-physio.de/file/relokaloligita.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/29246908399.pdfIn PDF document text
    • https://protrialse.eu/files/files/loloxixidemifemaxowaliti.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/mobodapiwim.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/mexobefiluxaduwawalitikus.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/xikuwipitapiv.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/2j0b2pi914gs7smdh9nqu3vli7/mepisifopufeziketekuda.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/87725721597.pdfIn PDF document text
    • http://epicridesnepal.com/files/bexivutofasekodugikuzoxex.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41121561702.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/3pl618cm8j2d9asqkgd492pe8m/6687118796.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/1299730257.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/xojonude.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_off0000ccb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB0 10832 bytes
SHA-256: cb3e3fc60eadb49906460bae5cbdc16cd74f10544f7fecfef374b31dd7f27966
font_01_sfnt_off0000e5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E3 17740 bytes
SHA-256: 04edfb9c8bafa7047fdf8d1d82b68e02e7a7f33972f20e7d9ae33a72c3b330aa
font_02_sfnt_off0001147c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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