Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d113c27f5456be6…

MALICIOUS

PDF

86.2 KB Created: 2021-07-31 20:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 624cc5989a0216f4873b8ce05417e18b SHA-1: d3d631be822b6b36b4e7726d40dc01f2b94cb57b SHA-256: 4d113c27f5456be6a5578c2dea020e0868f08abb6a097158977014b2162aa386
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. These links are likely intended to lure users to malicious destinations, as indicated by the ClamAV detection and ML classifier flagging it as malicious. The presence of link farms on disposable or compromised hosting suggests an attempt to obscure the final malicious payload or distribute phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d5be92536---94638367361.pdf In PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/37aoq8m0tof5e1lk7cgdedt1es/birikedijuzowu.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/pijojusewasug.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/welax.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/6o2m98iv2a9249brdb1isf80l7/59085232461.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/338c4d30282ee3f258b35b464459a47e/bibasedi.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/kikewepijekaxug.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/3erq195iokft7bakch9rth82k4/32229918820.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16102c89d3e2c8---76727302085.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608256059329b---72630421702.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4a89cc9b6---45272484819.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210624032010.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/65da65e49b6c700fac5b63db35fbee72/54845755118.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5cf401df2---73254884513.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/wixivikuj.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f570bb59f7---novot.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad29835e626---kufaw.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16071ce639c113---tujofilojuwojimide.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/2515f1a6b8103af97bc71183b1688a3d/97195686954.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dae1882160---sasolofazedowuxujife.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/mirebedaserefi.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/b24788ae20f6dd5650342574bf84831e/4311506192.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/dalobiwewavepara.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/e0d691b0ba95920bc0591bd80fa7995e/vajogen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=economias+y+deseconomias+de+escalaPDF 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_off0000eea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 10432 bytes
SHA-256: 650926a84353fc98c87baa2dcc74e933fb65a287ad617e7fe871ee4db77387f6
font_01_sfnt_off0001063b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063B 17656 bytes
SHA-256: f1e0a4c812b055775174c469d34f76229c13eb955432c4e7ca5dbf7a26b19ba1
font_02_sfnt_off00013328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13328 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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