Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57f29cfbd8734db…

MALICIOUS

PDF

84.8 KB Created: 2021-09-03 07:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 26511d7dcfd0f5848dc4485183579053 SHA-1: ae3d7d68cd2eae73b916b21fdffbf348f088f249 SHA-256: d57f29cfbd8734db97b45142185862bc4f31da92bd75c549b5e996b8ad2c259a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=honeywell+thermostat+rth2310b+manual PDF link annotation
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/k9qj6oj25fgbn6d6cgd3lcllsv/tozifepuxaxuxamumagebozas.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/direnigegepogenuzot.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/78406598680.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/19060327584.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/velekubagilituzonoduwi.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/rofazuken.pdfIn PDF document text
    • http://splogservice.ru/content/file/90725368599.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/42984817225.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1d3f535ab---bagibabepirutekaj.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/vosikofopodabusamujub.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/2o01rq73jsongbr4srcub15juc/dowegodelume.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/tobigit.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdc89811d3---gebogevuludani.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/61391355563.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/suwufadudibinewetimokatoz.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a01c057a54f---fofafu.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c78fdb414---25748819449.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/545ac69edef0106a9450374ef0537355/duwanisuxaxemadevako.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/87209414656.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/82054794078.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/2d878ba87010c4caaa76c956ebc64f32/fipozi.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/lawevetudogorevukop.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_off0000e4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D1 11176 bytes
SHA-256: ce3ede50bc3f4220cd1e8e17b84fc207448472eaebb82b3944ffe4e5f156ea22
font_01_sfnt_off0000feee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEE 18128 bytes
SHA-256: b1418fcc6b642f26eceab4e8f565516f63347bd6a76634123720f2c655595870
font_02_sfnt_off00012d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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