Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05b079398cdd6a6…

MALICIOUS

PDF

77.1 KB Created: 2021-09-04 04:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: faa8c7bff39fe3b84b46d1795b7bfebd SHA-1: 947018f258d5c37a908ab6defd16ab1124abdba2 SHA-256: f05b079398cdd6a6fd5c99198b1eda15795355c5e1130286512139513ad50a85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm, with many URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. Although no scripts were extracted, the structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/4e3cde6e6d852b5c7c3e7d79dcd05665/gedevegakunu.pdf In PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/c4lqfpo609skmo70ibafrousbs/bolozunisifubanoliguz.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851fe982d6b---repakamavigixoki.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/hmr5h98sl0ftdpq9js0mt9s1j0/89234020710.pdfIn PDF document text
    • http://timebymtm.com/upload/files/6368441634.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3d5daf8a92fda0bbccffd4ef81697975/vodirejudota.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/l57devh2v1jugqh5st0gtp0g1k/favefibur.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/dca4cf10fd9467beebc20c554a03b163/juzozuleje.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0b96bd457---pojifazanef.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/9d3e3043a37dc8d406db25d31826b54d/vepidemeneruwo.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/8932420123.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892c0ad6fd1---danajasameredepoda.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/maribobotifugifesilul.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/59abbe186aae2814db2c78e52127fe8b/9891971000.pdfIn PDF document text
    • https://citytrafik.nu/images/file/67691879180.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/918dbe187faf1acaf822836eb52785a0/velonofodipetofipava.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/wixasopabegof.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/70715666300.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac236835090---35362071382.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/61c05jk8nllb6l8c6rs6t0hl5c/zudosarovubitizokorus.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112c3f8aeef2---88608757180.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884a82c26f0---kajerojijufurawikud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=geometric+sequence+maze+worksheet+answersPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B0 10972 bytes
SHA-256: 5647a7b40c4715a51bef2743b29acd690d825c36e9d9b4540a67ec73ce7581c8
font_01_sfnt_off0000e11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11F 17468 bytes
SHA-256: 3359486b7578b5c594c6a6bcd88ba9699033882e91ed30d90b99b7be86a73757
font_02_sfnt_off00010eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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