Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a88ccb19f2d92bb…

MALICIOUS

PDF

76.0 KB Created: 2021-09-05 08:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 192278bd43666a12e959fc652ed3d8d4 SHA-1: 3bb1615a401f4e42d11e29504e557e0b73849376 SHA-256: 7a88ccb19f2d92bb5253b897efb0c143a56b26b0445ed950c44d5095d1e6ed1d
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. These links likely serve as a lure to direct users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://short-story.ru/upload/file/82245863092.pdf In PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2538f69c2a---70243267185.pdfIn PDF document text
    • http://jsdarvin.com/files/tojivaluvukikuli.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16087480b47202---26116530496.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/gurud.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/12007505772.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b559cae2772---92850889777.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/94371493681.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/rcv6tqlr0f4jb0hise45f0tum5/23754576481.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16257163152999.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16219975038822.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160865137d1ed7---38952340503.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3ff58acb4a3485472bdde1a8172c165/10128567424.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d81e8537c6ace251837530589bfc9855/devesoranaziwijuva.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c833c71cf9---33555538567.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161225589845d7---3601467078.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dad7e0d24---kipefuj.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/62473467863.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/ic79statg2rkoeavvk49kkrl5r/28346717878.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/53b2b11ec3bac68d1b85811a050a9e0a/64029199845.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607525f71aa9c---juwamizenolet.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/80945072021.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/de3b3a3f7afb09d21b5b6a99fbebe7a2/vidupab.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f31abda2e00---58745058537.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/vp2bbt2cbk7bp2tcvhj6ooiet5/72040015506.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///53946260150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=say+something+i%27m+giving+up+on+you+sheet+music+pdfPDF 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_off0000c242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC242 17700 bytes
SHA-256: 0538591ffe52b35ccd9ffd7d38144adbd196c65be0432c765ac1fc2671da902d
font_01_sfnt_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001075a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075A 11308 bytes
SHA-256: fe27389eb54b32cd6a1b5b40944116d1d97489a892dcdc26798556d2fbe76c2b

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