Malicious PDF — malware analysis report

Static analysis result for SHA-256 0863f40994a3a853…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 00:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7c21c3bcc55968201d64c1ee6505b4b1 SHA-1: ed054fb21b0a088cc2364b844ede1c60fb9cd346 SHA-256: 0863f40994a3a8535847197dcaf33d2479a029c5c32f1bb5fa555ad9d7818b1b
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS platforms. The presence of URLs with 'utm_term=a valid visa card number' suggests a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://zniczekowalczyk.com/user_images/file/1261216411.pdf In PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/dolofegabexujamogumab.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/buvapuguxome.pdfIn PDF document text
    • https://scalper.ir/data/files/file/fubalipefupo.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/99975086291.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/toxojumanip.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/wexupogeganukixiroweseje.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/79328008065.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7066c2918---23196480023.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/jixefawunorosujasugunukik.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/43099730909.pdfIn PDF document text
    • http://balone.net/_upload/file///minifuxobik.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/99040001500.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/pejipurodisemoked.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1e09a960de91800af1f1622a2e5de50c/99460309687.pdfIn PDF document text
    • https://motoralbini.it/files/file/58362938043.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/218c83af10d63b41e733fd41c3adbfc1/80061485679.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/fawuken.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/begij.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/16461700890.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/ropetubanadazu.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/difelopi.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/42497800830.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/78853422308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=a+valid+visa+card+numberPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140efa3a2c3a---xuzukazi.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_off0000deb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB0 17432 bytes
SHA-256: c9ac0c45a91b355e24081d6cade97f2b5a0e9ff5ba8cc057f279ebd4d1317fda
font_01_sfnt_off00010c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C03 10600 bytes
SHA-256: 0349a65c74b4d1f6d953c0c478f5d0919e8c0950974986a31e6990946b8b3335
font_02_sfnt_off00012437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12437 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.