Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb489a8dabb5a22…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 12:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ace9ebeef38d742fcc6d2fb4ebe024d2 SHA-1: 4b009110de95279266281906f638bb8836aa2f75 SHA-256: 2bb489a8dabb5a22fb7b545f67210535e2f703c3463565b7f1c851f899a5a504
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of multiple links pointing to potentially compromised WordPress sites and disposable hosting suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature, indicating it likely attempts to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://eobliecky.sk/userfiles/file/watemulak.pdf In PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342a5b912e7---vadibemolosi.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/68358199132.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/ninijufap.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/jotebawij.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16132832708dd2---nogunavesujofomibapavu.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/fejivavet.pdfIn PDF document text
    • https://best-label.com/upload/files/45114977366.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7d5264eb1---5219305294.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/61681705293.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131098e4d6e7---bamixipeninolira.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/26631544955.pdfIn PDF document text
    • https://jjpremiers.com/files/19627106886.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/49778974179.pdfIn PDF document text
    • https://sim2007.com/files/46528598987.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/tevomepa.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/foxokaxijipo.pdfIn PDF document text
    • http://espwireless.net/uploads/file/74116678721.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/15393889911.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/83749556943.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4b5700af3---12623602727.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/45653701259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=prote%C3%A7%C3%A3o+de+tela+androidPDF 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_off0000d556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD556 20972 bytes
SHA-256: 3a54c4d4a87635d6e7e089cbffb0e39e8cb0e51333ceb7075754a28840758040
font_01_sfnt_off00010904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001211b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211B 10540 bytes
SHA-256: 870d17937b71aa44dc19180b946498a909bc8eb69929312c82a709890fc94c5d

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