Malicious PDF — malware analysis report

Static analysis result for SHA-256 e44e4d060c2a0033…

MALICIOUS

PDF

75.6 KB Created: 2021-09-03 17:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 163fc555a14f63755692cf6a48ffbd99 SHA-1: 748497c7932688faf63c73abbe5b97f1bd16d4b9 SHA-256: e44e4d060c2a0033d2e4577b2e81523fea6769fd1a5a6b8d891b1ea9cefd8afc
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The primary function seems to be acting as a link farm to redirect users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://pistant.ru/uplcv?utm_term=manifold+learning+review+pdf PDF link annotation
    • http://deaprogettazioni.it/userfiles/files/83966431160.pdfIn PDF document text
    • http://aps-mes.com/files/file/6039359141.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/25546602163.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096c0f790711---14492019423.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/6qekidbimqrgm7pfb5a12s5jq6/jozepunewopusozaxufaju.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/7u7nntvuc5khcf830r9gt0q8b7/gaxebatopus.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/7dd8643f4e809d7e7540d3b90b35f0d7/81669348010.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c696c01ee0---zipudumukemojebutefasex.pdfIn PDF document text
    • http://hoacanh.net/luutru/files/futigozopifowuzorigod.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/19517310608.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/safugujelomijomufipuxe.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/76976387795.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/4bea2633078055695b207f1ac71b2854/26536039977.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/zixomenanosuges.pdfIn PDF document text
    • http://www.moyekolodin.com/files/nenened.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/83361481296.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/fomekerigomitetezejavu.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/b4450bbee8315bee488dc70225dd11d1/32362396740.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/a9890a3409dd70baa1a50c0d5935ed34/19112196945.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607db5cfeb741---lizugujubirefun.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/pidugimak.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/l8daicv93dn48lnol8e0lhmvn0/84825535909.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093b3f1b8995---pewoxexodojamis.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/17375088636.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f02d0936b7---41991481539.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1620588286.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_off0000c65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65E 16456 bytes
SHA-256: c69504fd570a7724a53396a696705109616b1c4e5495e7add84a0db915b4f4e3
font_01_sfnt_off0000f05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 10552 bytes
SHA-256: 786d9ad8e41abc9a93663d24cd725ca725016108942a77795dec454dc842ec06
font_02_sfnt_off00010851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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