Malicious PDF — malware analysis report

Static analysis result for SHA-256 f07f3493d9ed415d…

MALICIOUS

PDF

94.0 KB Created: 2021-09-23 07:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 92bd45ab36952cf984fc07a1400aa88b SHA-1: d6d78ee845e24c3df4a203c1b0fe6b980c6ab7b0 SHA-256: f07f3493d9ed415d3d04d314d508f512aa207e85db86125ceb691b1b5176e78f
156 Risk Score

Malware Insights

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

The 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 one hosted on a compromised WordPress upload directory. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, suggesting it's not intended for direct user interaction but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://przystaneknida.pl/data/aktualnosci_imgs/file/mowobudotukidenibugeni.pdf In PDF document text
    • http://allaboutdowney.com/userimages/13790163828.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/fopukonam.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/7156889236.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/81377742889.pdfIn PDF document text
    • https://linker.tw/files/84959996459.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/midomafup.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/tofimesatakukosufezelij.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/fapebasixapaxerigureveguj.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d94aa0ab15---jobetevemototopavuripef.pdfIn PDF document text
    • http://machulski.com/public/file/88506414846.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/93201735785.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/wewewagulurefadezi.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/6356765405.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/sutetepufitesasowova.pdfIn PDF document text
    • http://mlight.cz/archiv/file/23924797849.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109111912124348.pdfIn PDF document text
    • http://erex.hu/upload/file/89930255617.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79930750119.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/dejibodukatasiviwogiwafaj.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144cf8b346ae---73992973135.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/wiwobokezogopetera.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/vitifajarexidoka.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161482e23e2dc3---vonetikesujerovi.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/pivapige.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/fozifapufotege.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/63186514346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=movies123+the+walking+deadPDF 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_off00010253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10253 20552 bytes
SHA-256: 246a3d4bcfed3776eef66c7046c80d8e3bb8708d6793f1c37c428b5ea48addc2
font_01_sfnt_off0001388f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388F 11008 bytes
SHA-256: e75cb6e824068e52baa3fc5e67301f7884cd540abaccf6749725f3327ac36046
font_02_sfnt_off00015217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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