Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1668f115c34726e…

MALICIOUS

PDF

94.8 KB Created: 2021-06-29 18:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ab376e8d4352cbaba4ddb158bebc08b1 SHA-1: feff57eccc67c46bfcece78baeed90da09fcc719 SHA-256: d1668f115c34726e82fb5d44cd4a66ec43a7842aafc1c7b91a309d05ccf7ad66
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to lead users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pistant.ru/uplcv?utm_term=jee+2021+result PDF link annotation
    • http://longarmacademy.net/fckeditor/userfiles/file/dimatebu.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b46676f25---10081167998.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/0oa5anu9287i460gon0c05bqp6/dufamelagimojikapa.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/v9v4b8iq9t56pfe47jtjri25cl/bipetude.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/wexavugik.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/79223676560.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/54807911840.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16084c4452e643---49009026008.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/7247731854.pdfIn PDF document text
    • https://avela.md/userfiles/file/namirefadudirumo.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/92470228474.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a948cb2a8c3---87332074197.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/gugagolapebusadetamexe.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/70990417051.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/85ced3b72cbc6e8ded1ac9d73ee0b449/letupizikegu.pdfIn PDF document text
    • http://20thhelicoptersquadronreunion.com/clients/71358/File/wagiwogemumenekiwid.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/035289968c3ba1f95d8bb9b57fec3ac9/tuluvagareranenij.pdfIn PDF document text
    • http://texmet.pl/userimages/file/jagevomikoroleb.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/kojogazekeku.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/99976638536.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/fobununefujiluduve.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/32677948462.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9c8cbcfbc---buvevabifizosifesap.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F9 17696 bytes
SHA-256: b77b9bf553b28d9020e26df220a9b616d6584d45580ab8d8cd9e8260d22a954d
font_01_sfnt_off00013f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000157ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157AB 10008 bytes
SHA-256: 3bcde5957598a3583892d9b12586a37d48da6369266d0e5638301159da22c549

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