Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88e0393691185e6…

MALICIOUS

PDF

90.4 KB Created: 2021-09-02 01:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5bb0f8f7e942fbe7f4fc1d8a608d6b41 SHA-1: a7c42c397a8b887b46bf930ecbb78455e78e1d8b SHA-256: d88e0393691185e6f1831490b5460fde0d287e7faaf9e30daa31b229ccb4c348
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da6ffbcba7---filunotedezadoxepesege.pdf In PDF document text
    • https://binarbaid.com/public_html/userfiles/file/zejidepusuzudizigemov.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/49700376829.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/7006996120.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/45696854041.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16080826bf0050---rejinejuge.pdfIn PDF document text
    • http://rld-carbon.ru/file/46563431424.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/96754352080.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/394s098pag512cqg7b256gkao4/95309811792.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/78e3f6558d32c086b86915f51ddf392e/19648894519.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1cc89994a---lamasikuwupuwidix.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/xudepanotariva.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5969bc2ec---15291471107.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081275af010f---sozetisupubok.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/18675749318.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/8883568069.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/lirudenurir.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/13f12632b623b7f232a7201f739ae8d2/99140203107.pdfIn PDF document text
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/bigomelavamipejojavokefo.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e35a990fd---97956535879.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/67587446327.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/jejitajupotaxuzikubajuko.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feb498a1aa---76518800057.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/88257900231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=fire+emblem+which+house+to+choosePDF 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_off0000fd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD26 18128 bytes
SHA-256: a25624d223b6a803ddab93b85cdacee43f11abfb18f38ed2a052abea61748a0f
font_01_sfnt_off00012b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6C 10532 bytes
SHA-256: 2b7bf9bf5b474e99d549758f04aef558bff2b4637cd77575df05c4def3e5a1ef
font_02_sfnt_off0001437f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1437F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1