Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a33c4ac3c845bc…

MALICIOUS

PDF

72.7 KB Created: 2021-09-17 17:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d8cfaad1c561a1082fbb6abc00e9476e SHA-1: 078c1d1c8e9dcaf574d38f15be5052e901213b20 SHA-256: 79a33c4ac3c845bc7c809ffbd40a72d8c556aa981d59c7eea106c18e1216a7f6
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, pointing to various compromised websites and disposable hosting. The primary purpose appears to be directing users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medvor.ru/uplcv?utm_term=gta+5+cheats+pc+wanted+level+down PDF link annotation
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/34f6d5d49908a020b44687a113374b4e/75393400567.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/vuzisoborewelizalela.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/20224070241.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161437f070e9b4---40648771675.pdfIn PDF document text
    • https://interconformity.ro/images/file/70263346948.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/e412a5b006b10cb429950106293ede23/metuzufinafezo.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/vebebutasitu.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/61254893574.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/91685433853.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/judolarababerevad.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/fijig.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135826c79277---soturud.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/vaxerikimabubupafabozesa.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/59883480942.pdfIn PDF document text
    • http://nincity.de/inline/file/17907437582.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/pagolejifegixatiti.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/2716688087.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/88177070949.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/2a374fd0872815a41b14f3ec3fa05a85/787919392.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/fovulofasalomo.pdfIn PDF document text
    • http://synhbio.com/upload/files/58274533211.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090219235873499.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109090051073424.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_off0000ba09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA09 16452 bytes
SHA-256: 1cadb5a547dff2bb18747a718b4a9ffe169dea02f196ea7171d01657a73078f4
font_01_sfnt_off0000e417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2E 10744 bytes
SHA-256: ec6aaa0962982f0c2895433af78f12aaebc94d8d21df8da66214a547533c1ef3