Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98b64d2b6673b19…

MALICIOUS

PDF

93.4 KB Created: 2021-08-29 05:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0b6e413152e6ae7d3466a3ddafeaa89d SHA-1: 2976da72dd58c828e4a6d735d8bc9f264bbcf802 SHA-256: b98b64d2b6673b19176dc2cd88f8d17ff442149dd3690b7c6b6e4a354151d2d5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress upload directories. The primary purpose appears to be directing users to potentially malicious content through a deceptive link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://aci-immobilier-douai.fr/userfiles/files/36979075134.pdf In PDF document text
    • http://sevimticaret.net/userfiles/file/74663509132.pdfIn PDF document text
    • https://tdfstore.it/file/57582362509.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/dopiziwubedimexivab.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/12187787872.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/620ebb66ec307db99e3f1e1daaef87c9/97842607457.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cddddd663d---62681284889.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/176459600060b1baa77ef5c.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e5944f354---pelorufu.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609261b12bc21---medagoladi.pdfIn PDF document text
    • https://digireg.si/upload/xasubisanagakimoze.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093b0f7a2b8c---sedifasevaju.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21261a5397---lagezupex.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609f976dece25---65252846329.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608c626ca0fa1---sitadoxujup.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161206578d1267---4670770198.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/bojasafumakadesexos.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/48331308212.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/vowowinolojel.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/02873bc9ee2acefce11c696e07d046f1/50779089615.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/6478d76dc31589a763d2a671ffe3fba7/17823061038.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a373c29da02---48615370126.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/10067990296.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/38173550897.pdfIn PDF document text
    • https://diphong.com/uploads/koxubujuwagiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=my+vision+and+mission+in+life+as+a+studentPDF 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_off000105a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A8 10688 bytes
SHA-256: faf75d927a6b654c3ff6157a3b92fbf18a9584771a322923c4af2e24772af927
font_01_sfnt_off00011e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2B 18556 bytes
SHA-256: eced74bd6e35bb028253361bc7f35e47708da60dc17d38e232897632973b3d66
font_02_sfnt_off00014ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1