Malicious PDF — malware analysis report

Static analysis result for SHA-256 99df87bf0cd76754…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 14:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6f0f7b4777b7c15e830d8bcd22a3f991 SHA-1: 25898f2242437b75ae06a2ca7a3bc631d8a15632 SHA-256: 99df87bf0cd76754606f3660917cbc4df3772717463285eb47480f33e44d85ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://huntic.ru/uplcv?utm_term=cat+420e+backhoe+service+manual PDF link annotation
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/qspu3t78e7r87ued7utgibppf1/zofubijisizi.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/44907965038.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611db3352f5dc---xitefukogobegedamobesumij.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c82278ac5e---lepokukovipokazumoxixalez.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/41874761739.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/bunewugiwe.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608022579b0fe---kibewukomawe.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/cmf56r3dapaq4dis0ti48plob1/53330146312.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160986002f3176---26997755415.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/binepivadovirodasalaj.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/poxubozafujidi.pdfIn PDF document text
    • http://thechoose.it/file/mipobixuvonumik.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/sevopubaxelurofekavi.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/wujumewafilozavemosadiga.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/0544963533c627e69a8d3e31b4c87026/jasifewixabatujirovokajo.pdfIn PDF document text
    • https://landi-bg.com/images/file/80177908525.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b54b607bcce---78630690167.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/71lhd7tm18brnnhj85b3qlh39j/keminazenusijogowa.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/belejujok.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b3921b952---mafudinabapabis.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/614c32b80c963ee9b1932c53967d7f55/10215169345.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_off0000d9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A0 18068 bytes
SHA-256: 9127e5d2f8189a804f770135bc12c686d57d9d0373631e54975533a769bf0873
font_01_sfnt_off00010911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10911 11244 bytes
SHA-256: 2478ca7a990cbdd59d2ef11d1a4eebaddf2862bb4c3fb8b1c1767933910f862e
font_02_sfnt_off00012360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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