Malicious PDF — malware analysis report

Static analysis result for SHA-256 d63c34e40defa631…

MALICIOUS

PDF

90.4 KB Created: 2021-07-07 08:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7823fb4e1806c8fe9e44d99b96d60f34 SHA-1: 0b0e97c416c64571ca313fae12171913e1a7b3e7 SHA-256: d63c34e40defa631997641ba2613a9e61786bef37881a036cc4c896741b17229
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/n468jlsjq0i3ab0sdcadft473j/jetamuxifenus.pdf
    • http://simonhoirup.dk/userfiles/file/30512337428.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/0dda88938b66d270641f037a1bc7018f/35898027031.pdf
    • http://aaaexpressac.com/userfiles/file/babobowixesovopupo.pdf
    • http://asja-doll.ru/userfiles/file/44367306989.pdf
    • http://pokorny-podlahy.cz/UserFiles/File/budejukixapivef.pdf
    • http://dsraxys.com/uploads/32202388449.pdf
    • https://pet-fashion.ro/mm/file/kerufibuxavivefopa.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/710590aeb65274bbd0a91f9c1a1a6b47/74037781899.pdf
    • https://ntct-dz.com/ckfinder/userfiles/files/73877037306.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/0b379179d1cec37168ef6b19ef812935/kigadonanufelawosubidok.pdf
    • http://vorne-sitzen.eu/pcms/content/file/27872466694.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/38e775565db46d01f4e0bf5fbfa423ae/mexakunofu.pdf
    • http://sva-jeanroze.com/xmedia/file/36305796869.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/097d2f1bda4b86e09e206a65bb591771/baxepoz.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/89dd430266aa694d9b22f497360a610f/vukedejuvobebuka.pdf
    • https://abandassociates.com/ckfinder/userfiles/files/18747597272.pdf
    • https://pmsp-me.com/userfiles/files/jadejitaduwolamo.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609aed8a5a891---pixejusir.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609832b8ec61a---fekafajipilunemavetugemo.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1b063e81c---xofatuzijugapulula.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/6a988fb4a921d6b349dfa34234565cba/dagatinu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fce7e34783---23543226652.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1b2584ab1---7115631915.pdf
    • https://ppuhperspektywa.pl/files/edytor/file/1600321777.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=night+fall+every+day
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD98 16792 bytes
font_01_sfnt_off000115af.bin
3daf6ddefc202d8290d9ff1a2907b917237dd9b1ef6ab97a9552600677f2b86d
pdf-font-stream PDF embedded font (sfnt) at offset 0x115AF 10396 bytes
font_02_sfnt_off00012d1f.bin
4b1a3747a89a81628631f1b516f5f36d7f21859113e6c279f5b07927d5468934
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1F 17432 bytes