Malicious PDF — malware analysis report

Static analysis result for SHA-256 2be0f99c8c867ce9…

MALICIOUS

PDF

100.3 KB Created: 2021-09-04 17:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9358855c51b3412baaff1a76b595e8d3 SHA-1: 13ead168856adfc81eedba96e76f2225ba6b9a9b SHA-256: 2be0f99c8c867ce975f2155028c55fc776c0eec6b62c9fa54e515ed29ef6494d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to phishing pages or download further malicious payloads, aligning with a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608263f1661f1---zepekafalosu.pdf In PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/57612148073.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/64563039181.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071829aacf02---34236265591.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40acc89fc3---94364931042.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/fanoretamevolatuk.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e494d4b4c---38146108491.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/23826562330.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bf9eb9d14---tisopujenabok.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/vokinupogamejorisojob.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/62565608530.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/gepabi.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9625369ab---34011979121.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/92548596154.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/sezajukapufadarasoki.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/6odll4kcpi0e6bl4ujfp0o3286/71408998282.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/60029077252.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609188da2258b---14813174189.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/16207005052.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/18kkvsk8br08pm31fr2qh8d1ss/zefido.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd3fcc500fd---59679136492.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/57671062924.pdfIn PDF document text
    • http://darec.sk/files/files/varatinosuxamugirexumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=tecan+evoware+user+manualPDF 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_off00012597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12597 10416 bytes
SHA-256: b73faf1a2b7273b4b5801813808e1e5853bfabab286b591ea8417bd5ffea351f
font_01_sfnt_off00013d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001555b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1555B 18096 bytes
SHA-256: 299bd35a46dd2025780d7ce61d5db6cd0ab7b31879f4e7cb52142a41350cdb2a

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