Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ae22e78b2ed2e1…

MALICIOUS

PDF

77.8 KB Created: 2021-09-15 11:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d6a1645fa8064a7023e70be2b07db64e SHA-1: d2bb20b4e5278338b31ae17ec44f1379934e441d SHA-256: 33ae22e78b2ed2e1e6f777461f0e969a4915ed00241e22ed457c8825bfdb8907
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF's structure and embedded links indicate it's likely part of a phishing campaign or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://n95america.com/wp-content/plugins/super-forms/uploads/php/files/44f9eb8a6031f5f11eb3a4abfe8698f8/87955820290.pdf In PDF document text
    • https://zoorichi.com/temp/fckeditor/file/dimevuzavuzofaguvexetidi.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/75014984153.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/35325183306.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/fuwixinotasajavigama.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/37535548795.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/63922076522.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210909002532.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/46155408370.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328d9431408---76359943082.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/pabad.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/29674476427.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161322f4046222---wafawof.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/96119499446.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/70562306580.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/84812488563.pdfIn PDF document text
    • http://centromp.it/userfiles/files/jatukidafogekujam.pdfIn PDF document text
    • http://proxima-online.it/public/file/40626903757.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/35505244248.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/tileveninabiwazosofetunep.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/ropepavewasifonudiv.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae46743dcd---dunusas.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/86542882405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=pokemon+sun+and+moon+gba+downloadPDF 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_off0000cb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B5 10720 bytes
SHA-256: e0c2f8ec04ac0f5936cfbdda3a4697be11dbbac89246e9e6d5b98df0329338af
font_02_sfnt_off0000fc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2C 17632 bytes
SHA-256: 55345e65aa2369b22e2d50728a4af05db02d84fb0d7aa468e3e52ee4e99eeb5e