Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0bfd6d1d8bc4a34…

MALICIOUS

PDF

78.9 KB Created: 2021-08-20 14:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4c4055ac535a837c879c3e2f07fd3c39 SHA-1: df68078733590701c7ed116aed5a7e989c94db34 SHA-256: a0bfd6d1d8bc4a34cdeb90a0ca173d2d60830c25990e4a079cc48d941b5a4613
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The presence of 'utm_term' parameters in some URLs suggests a phishing or spam campaign aimed at driving traffic to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://chcial.ru/uplcv?utm_term=humne+jeena+seekh+liya+full+hd+movie+download PDF link annotation
    • http://1976ahhs.com/clients/32223/File/1801496450.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/ea88ac80156dad5979812c336ca1084b/42663601538.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607953e89da83---9881350069.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/kefelafekib.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160be4269b86d5---davuxigateforesel.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/3f58c77bde1cba2fc8542cff6b44ded2/82533394818.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1d50ce3a7---31008846257.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/26209055539.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/4090093832.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/malubavojuso.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/4684fd2b1ede6dacde0bc1845fcdad1a/gutusetipolezabifimus.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/keboxaxowogojapekurotexoj.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/51886739370.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/fonogebapezesifaxaladuz.pdfIn PDF document text
    • https://t2sc.me/userfiles/10538452945.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c12e2c8bcad---kovepikik.pdfIn PDF document text
    • https://motiv8workout.com/up/files/11660742667.pdfIn PDF document text
    • http://g55net.com/webpagebuilder/ckfinder/userfiles/files/gemipobez.pdfIn PDF document text
    • http://promador.pl/userfiles/file/26359030887.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/22202172629.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/91941571620.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/xorikete.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/gexemulezadepupim.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/43585365365.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/8063004617.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_off0000cf98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF98 16932 bytes
SHA-256: 9892528bdc5df69968080678a40441a5da2c08715c3474060b9b60284e8bb362
font_01_sfnt_off0000fbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDA 11000 bytes
SHA-256: 259b9a43f4aebfb4a2bd5276069039be0739910046ada7575041527ba6e29709
font_02_sfnt_off0001152c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1