Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c738d4e12f01b38…

MALICIOUS

PDF

85.2 KB Created: 2021-08-05 12:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 24914d6d9f23d5d9295a99fe7ce28b85 SHA-1: 7f2f13963b62bc1ce355a076df48da18b8934479 SHA-256: 6c738d4e12f01b38ca5e8c5cd35d617f528abdd9e06ccf87cf0726e352afd912
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 ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs that likely lead to phishing sites or malware downloads. The presence of multiple external URIs and a link farm on disposable hosting indicates a deliberate attempt to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=stickman+warrior+mod+apk PDF link annotation
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47e0fd9bad---kulekomobosopepose.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/nusirepubisugutigedif.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160924a1a546a4---65374720112.pdfIn PDF document text
    • http://owtsreunion.com/clients/e/e7/e717deb27d844c69ffc49b2d3c0bb1a5/File/64842919199.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a330f30417---32208898985.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/pekojol.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe8e03275e---jogasakidiwumiximeni.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078817b0a874---muzegamapef.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/c9apil55vr6qm53qnv7g5rgigr/819874773.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/97120784611.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/8657132376.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae01ad1e4ec---kenojisofiw.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f30e69d35c---fumofolitijojogefojufiduz.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/watujusexafotugopebe.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/pabew.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210716_004156.pdfIn PDF document text
    • http://bahsclassof1965.com/clients/1/1d/1db829f64c2e26d3b32b12ccabba4d7c/File/wunuxim.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/99586206315.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/2c7ac57636763ff2d5b3e05be47ff597/wakoxabilutafepegifedel.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911afe1c7b1---tupotowaxawujuda.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/zerogawurulasul.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/30670270089.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839f60d89d0---wazufumumexub.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/jofujadojitobotetonajux.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/35b50f36efb82076e4c11e0144390965/41505203382.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210622125704.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_off0000ea8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8A 10580 bytes
SHA-256: f4dc48e5a152b3b0ee03a22817ee682b0f96a061c7de699ac246874b139a5070
font_01_sfnt_off000102b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B4 17060 bytes
SHA-256: 35e746c20a0d4303e340e5366e1e816194a79928f843fec81088773e67d45331
font_02_sfnt_off00012f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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