Malicious PDF — malware analysis report

Static analysis result for SHA-256 354900a5f2ab4095…

MALICIOUS

PDF

91.0 KB Created: 2021-08-21 22:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3604e9a70b599574b8759ea9e4c165bd SHA-1: 41d603994c78f1e4458c0269a1b1bca26ee4e19f SHA-256: 354900a5f2ab409586d23be42a2552e2cc2129ebf8d5d2c73c8163a5141ea403
156 Risk Score

Malware Insights

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

The PDF contains numerous links to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and embedded URLs point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pinpointfeedtech.com/ckfinder/userfiles/files/13916892663.pdf In PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a66bca5b911---vonowesub.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160703f8f4d9a9---5298465313.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/20442f47fcbc8b6e3b776bf9a78789f8/62044391857.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/kogukosorelabeluwejobiteb.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c042fe763be---turikonomodi.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/58277938660.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/vases.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/mitevevekomorolez.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/nudesarevoxon.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/99130160812.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/repigufalelanepaxajomumi.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/51731328045.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/zifikavateruvuj.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/wiziligomokoruxebefew.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/giwegineserixomobage.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/girugaw.pdfIn PDF document text
    • https://peterdegendt.be/file/kumokelizimedetor.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/jetif.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/66655218835.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/df25b5da8570465b41926daec16fd731/61818476829.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/faremidexawafi.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffeb9e4016b---42619671350.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/729e9c8fa7ecab5f1aca67e44a1e4850/fakafuduzotasagoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=can+i+return+items+after+30+daysPDF 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_off0000ff57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11769 17352 bytes
SHA-256: 9c997cb739eed78fda5ef20d3896288a8c9ab9d91960928c5d359123a707bbc5
font_02_sfnt_off000144d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D3 10888 bytes
SHA-256: 4405992bc72def8f98ffd9e4c99cc48804f7ffb9fed63994eadb799ecc5af3fe

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