Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7645c02dfc20b4…

MALICIOUS

PDF

70.3 KB Created: 2021-09-03 17:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5703d59676bbbc15a1fef66e57c62eac SHA-1: 9f8ad3734691311cfdfd2de8d8fa8ac7c1e7715b SHA-256: de7645c02dfc20b434642b5a4b54cb15af795d020bccee07c1ba0e5617af9f52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://location-appartement-venise.com/italie_documents/files/66273662027.pdf In PDF document text
    • http://comp-art.ru/userfiles/file/16802010833.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608ef4ecf3b07---13480458116.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/94861047970.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/58788384592.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/300a09a4572fe2552134802a6d0a1b94/139014820.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/9485465e527fdfe307c7b4b6c0b10c74/tulipowozawa.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/2o9tqtchljcq96f4vdlvpvlgo4/pudiruvowunimomemovawofim.pdfIn PDF document text
    • http://realestatemiami.com/userfiles/files/34271839317.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/fuwiruwij.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/levid.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/41789852143.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/pofugedefunazoval.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/jerixavuwuma.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/n8q9g6nmrh9idt1r1rlkmpuqns/xuvenesiwexinolufifekiga.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/lebodepogugoku.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/95067570703.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4f7df3463---ziwimekutekasuzelox.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/83451508716.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/9349631887.pdfIn PDF document text
    • https://tsegypt.com/file/88211485243.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/nadolilif.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b7275c69d---wavupekolepu.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/2298a46476ee5f30144be0911fe01c97/bugadanuloti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=2.1+periodicidad+quimica+pdfPDF 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_off0000b3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FB 15344 bytes
SHA-256: 2b84da18af1a99600a9cf86d9d7c22cd5e42acc6a131c7032ab99f0c4d6fc27a
font_01_sfnt_off0000dace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E5 10752 bytes
SHA-256: 74fcb1418f6fd9b39dd75e06df0169d1ae1238c4bb82e67750798ac4ae4f5c5f