Malicious PDF — malware analysis report

Static analysis result for SHA-256 640a5325b8bb4fff…

MALICIOUS

PDF

130.3 KB Created: 2021-09-01 23:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1e3688d143b9ad21be64eaf954cc796f SHA-1: e1621ec3e036193f2c4edb7e4e8cc94db51d527c SHA-256: 640a5325b8bb4fff4a0c63313b44b0a370096c2a17a8cd51c00f6ab24312cb52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress uploads and other disposable hosting sites. These links are likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://smidgel.ru/uplcv?utm_term=world+quest+in+genshin+impact PDF link annotation
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121741d919f2---lujulowisejozaxov.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/29194368272.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/89491427529.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608317da1b4e1---debojukegatetupi.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c150ce770c7---60509339206.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160968a2ec98bc---ralukiwija.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/20216920243617.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/73555738454.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/26539130699.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/renumawegagi.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/99973472780.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608269338e446---13536365199.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/4am03pmknlqadb3spbariidhml/9965851502.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082821043d30---sovokijupazifaguded.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/ridabiferisalorome.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160afc789c026e---rubogupev.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/4satnr7mj3q0b4do8h0eb6it6h/61355344370.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b11411314e---86151200901.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/a69069b03a5fbc46092f051156404714/ripifobupomupata.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/lenujaruxunanuwamu.pdfIn PDF document text
    • https://braus.uz/images/shared/file/bazoneneden.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/671b8ba360938ea3d10e1d0e10f6d0a2/76707840299.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_off00019bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BEF 17812 bytes
SHA-256: 9ecd95ec21565d5187b3c365141cd0a2f643289a61cea5d6df67c5d05a09cbc0
font_01_sfnt_off0001ca20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E237 11200 bytes
SHA-256: 6fc6f6f578db4f84f1a66ba2d7518939b628b87faa92e784ffc8d6c7f90d1329

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