Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ead7786de3c895…

MALICIOUS

PDF

81.0 KB Created: 2021-09-04 01:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b1b9dc5e7e50c95ab752a26bd500beaf SHA-1: 47912e02bf3ee0cd803ec91b2539981541472cb6 SHA-256: 48ead7786de3c895bca66dabdc0f0eccc3ee7f92d972f6a9ce25251911a47d74
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Static analysis revealed it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://beauti-full.ru/uploads/files/tokafudojufozujom.pdf In PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/jitotofe.pdfIn PDF document text
    • https://armenia4d.com/contents//files/jumulisesojo.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/23910015266.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/92998699986.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dc2069c4d87---99665958819.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/rexugunixopekekevikenaxev.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/9bedb99582d8ed6fe011f116325084e8/gidezuxajuwe.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c073b92bf---zotog.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/d0e08b24c192db0193ef8d183ff6d983/pigojuligotoso.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/58268662260.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/92ef0b3ea3affba6b2e153985523d758/38687161682.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/86716540596.pdfIn PDF document text
    • http://01host.ru/userfiles/files/zopisezedabejodekin.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123817ccd54c---99907104801.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800ebc6c28f---2940490077.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/vesin.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/14630181708.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/lusurikugune.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/a5c630c81eff08abcf5b534e3b1a9f11/60979038288.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/78469074564.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/lefitazanunimek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=organs+in+the+human+body+ks2+worksheetPDF link annotation
    • 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_off0000d6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A9 17604 bytes
SHA-256: 77e40c306ef3bb1d8e79f39b35144b16dada5bdefa0dddd3f08a752a1dcd5cce
font_01_sfnt_off000103c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C9 11324 bytes
SHA-256: 14fa9c985b049226311fd070f7bc7f5487b372c398e244625aa30c69217c5313
font_02_sfnt_off00011e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1