Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ebe5db0db4659fe…

MALICIOUS

PDF

70.3 KB Created: 2021-09-12 20:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f24e517a6fb2f09e7de7d8feb45ea86 SHA-1: 655627970cddb5b09802f3094f84917b96219d9e SHA-256: 1ebe5db0db4659fe7079d989b169e73a77bdc01b9a49b7a90e5607f08004a10b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs clearly indicate a malicious link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://indexone.ru/upload/file/vazefozodovujadozuvitan.pdf
    • http://alfonsoguiggiarchitetto.it/userfiles/files/7442646487.pdf
    • http://philipp-haberland.de/images/upload/file/dufujefuwobigoxiri.pdf
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/nilamejifo.pdf
    • http://inciboya.com/resimler/site/files/rilorim.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16133f1e1b7bfb---89738770496.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/3m9qc97fgkknaaa5d8ftghi311/powedor.pdf
    • http://smalternatywa.pl/media/upload/files/e7c07826af46511bc863f80d387098ad.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c76257fc2e---44292298223.pdf
    • https://ventsistem-bg.com/userfiles/file/40059140425.pdf
    • http://prosquash.by/data/duwuzimomojuzim.pdf
    • http://canavesiobruno-architetti.it/userfiles/files/40826850378.pdf
    • http://asiadomainstore.com/userfiles/file/78593468549.pdf
    • https://serihosting.com/calisma2/files/uploads/58909841129.pdf
    • https://krassimirtaskov.com/userfiles/files/polelepomexagobuk.pdf
    • http://www.firengo.com/userfiles/files/gopuf.pdf
    • http://liqaa-lb.com/files/userfiles/files/kujibanobu.pdf
    • http://ckm-machinery.com/userfiles/files/42960654225.pdf
    • http://studiozoppini.com/userfiles/files/duvinenutinaxowof.pdf
    • https://petikdaun.com/contents/files/dovub.pdf
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/vutuwivafevoseforizam.pdf
    • https://falconshipping-uae.com/userfiles/files/78428103330.pdf
    • http://33podarka.ru/pictures/files/fajavonododozafuroxigon.pdf
    • http://datong-travel.tw/upload/ckeditor/files/20210910050730.pdf
    • http://bagodilovaspark.hu/userfiles/file/74161358595.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=courageous+full+movie+online
    • 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_off0000b608.bin
eed19b6c5a8ba7b8ba036f707c5e3002090f433101c7676649310c98c2454c93
pdf-font-stream PDF embedded font (sfnt) at offset 0xB608 14732 bytes
font_01_sfnt_off0000dac7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC7 16792 bytes
font_02_sfnt_off0000f2de.bin
c8400c25b41372630b1f6b20828d59259ea0e972778a0e5b82946f0e9d775a54
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DE 10656 bytes