Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1396136a50340c…

MALICIOUS

PDF

85.5 KB Created: 2021-06-29 17:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: dc7bf7861b0bfbdfead069ce953e11ec SHA-1: d8270f7712a3a064a6075fd60577553eefa56d12 SHA-256: cf1396136a50340c910a9137d792e50b7b64a9601951f05d93e616a4006e1056
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous external URIs that point to compromised CMS upload storage and disposable hosting. These links likely serve as redirects to phishing sites or malware downloaders, exploiting the user's trust in the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wastran.ru/uplcv?utm_term=would+you+rather+game+funny+questions PDF link annotation
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160701bc81d120---rolupumomegadujasinekuj.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/xuwoduwarap.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7aed55c843---xivaponiwesaniwuki.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/81cc5acf01ef3352f53a59638af7c91d/41276200981.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/30702374089.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8b50e68cc---xukodidadajisafexirexas.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/b572eeddc6ae73c4a6dfc4e64ff03b13/fuvibir.pdfIn PDF document text
    • http://sun-tes.ru/files/file/serikiwunorajedidupebafis.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/46df5a14ce2327241295dae5a651d0fb/zulewasudo.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/33181601973.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd7bb5c298---dosejidobitimemira.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a572f80b4a---jewidopagu.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f21d80e479---tugaxeniwiwekir.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/wekegalerub.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076072843624---jidukejiv.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/jizudokexozopedake.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/149d0de4b688b2d800eea9a6a341df7c/86191467367.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/68806779194.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/pogaj.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8eb632979---supelasusudalusexaxodoziz.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/4e947d887d748aa9353de25a60c27368/lepelufilosojuvi.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/f57d9921fba54af124e802e2a8ce3946/94896836049.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/6aba6714c4bfc41364c645a8a75d7412/lewem.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

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_off0000ebc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC3 11156 bytes
SHA-256: d4e5f2cd1d8a78d915c313428361c258adfc33d6ec8181e2118bda8770d5c64b
font_01_sfnt_off00010525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10525 16820 bytes
SHA-256: 84fe88d0740ce5d8d1a3df6070160ae27fa525f0ca6fd4e422929df7ac6dd818
font_02_sfnt_off00013078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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