Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece845dc6c9d0898…

MALICIOUS

PDF

88.9 KB Created: 2021-09-17 23:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 19583c99c9a4fb3210e2a705189c2889 SHA-1: b58a2bd7cbc128f91245f7c761e47c80cf8640c4 SHA-256: ece845dc6c9d0898b7e3a4bf7f5892a6c4208a7a343ed4a4365ba184981c8bf6
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various URLs, some hosted on compromised CMS uploads and disposable domains, likely to facilitate the download of a secondary payload. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=how+to+draw+acceleration+time+graph+from+velocity+time+graph PDF link annotation
    • https://superpackeg.com/userfiles/file/73696132012.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/bfikcjmn8isqsbmmoplq93li08/kabegosevilof.pdfIn PDF document text
    • https://labelmarket.eu/data/file/83489467201.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/8933051710.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/bomomogog.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/77286220004.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613735ad4b966---tabaxig.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///gepijovedolewogapenex.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/b8b3d20da5064fd18f6bc89b6dd7605c/18427882833.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/55238096793.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/kepubirogugopuwegisizux.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/25937060127.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/serapafewizumegafubijizo.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/ruxasegazurexazesonofazen.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/12094269108.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef2d4c7624---defurijasatuvoz.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/gojuferipovumoledudopuv.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/xarotavanekip.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/tiwunowaxegepukoligotiz.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/28183642270.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/oo6abaf35oe0nlfon4csu6s9o4/87494634605.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/38328981167.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_off0000f1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 11156 bytes
SHA-256: 410ff8d3a6b21c810ab5e3ee3ba563554bb0c2537bbea69bd08e3eb3d1cc8cbc
font_01_sfnt_off00010b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12381 18928 bytes
SHA-256: 2566eaaf63a0e76b59295af5bf2d758803a660f26819f7c3c00a796e8d5070ca

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