Malicious PDF — malware analysis report

Static analysis result for SHA-256 181502e7982bcc7d…

MALICIOUS

PDF

99.5 KB Created: 2021-07-08 06:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 82892ae4a5eb45d961ad9b6747b07462 SHA-1: 82a82bd8eb73492593a79e41386531fe8938a617 SHA-256: 181502e7982bcc7d90c1d383524f7915d04f2598269e8b81890149ce52a7b733
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised CMS upload directories. The primary attack pattern observed is the use of a link farm to distribute potentially malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://energy-labels.com/userfiles/file/zevedirapob.pdf In PDF document text
    • http://gtshotel.it/images/file/38580209254.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815db3aa944---mosefarevadinape.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075c5503dc49---vagoposazixikapu.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/juwitadajud.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/513d697100ef5e98d3bbd875a1b0382d/nozakufixuzisujemotawutil.pdfIn PDF document text
    • http://redtopmarina.com/clients/7/72/7297c65379f6126c97b8b18e62fd1dd4/File/pitikirukawawanokegufedew.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/5d1130c9c78fbdecdab6d09a6bc28208/muwodawunedi.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210702223641.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/dnn418g8nkv5lr8817uhr74hm0/5447393097.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf097d95c---2257138357.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e63c92195---73927312863.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/jasexaloxenuzorafun.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3341b7412---sivabovibafimutuful.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16e2700fd7---4184722514.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/wosofanipelomujidututeroz.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210601100033.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c882919bc83---poganirunal.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/vo5hpiu8l4pbhefa79s1sjh2j1/61759079708.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a046f0b1f4b---darupobobex.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2035ea9efe---pexugorurojidu.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/toxulelasejej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ymca+before+and+after+school+programPDF 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_off000120ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BA 17484 bytes
SHA-256: 92970bd508120b935e7c69e4b3e67c8d9a40b8bf477366f736769f1f6b4d916a
font_01_sfnt_off00014dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000165e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165E2 11096 bytes
SHA-256: c236a38059312a7b7485f51eb62b86f07e55d782e3afe93e695b2a329f511d34

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