Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7b0056ae134396…

MALICIOUS

PDF

108.2 KB Created: 2021-06-24 02:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 6678df685413dc7ad870cc2477b4d9ef SHA-1: 982945a5247a60cfe6c66659e6b58fd49312e2c9 SHA-256: fe7b0056ae13439696ad3f5921964a527f00978dcc682ae68ef5629308b287c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm designed to redirect users to various websites, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's part of a campaign to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://andrelandberg.com/userfiles/file/jabavakutidiluzusel.pdf In PDF document text
    • https://haysalon.com/public_html/userfiles/file/40631912971.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/b3fa6037d68a928f9dbb6351ce82a88b/22564152404.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/setinijolosaronixeva.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/xesatejojepokazuxiv.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/40023da4f5c14500e14d11d0dfd5c2c2/zuvenukipavavere.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/35179958815.pdfIn PDF document text
    • http://darec.sk/files/files/jipuzukadaluputu.pdfIn PDF document text
    • http://abnicum.com/files/file/xivumeg.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/h0se52hfab4ors3hbe3nvcou3r/konezuxegupoxivaxolo.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/7284834747.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fe7b336a4---57687689498.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/f58c186727d0d0e7ab3c357c5c4006f0/jegurejuluzigonuzali.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c047ec329c6---guwituwadafukejenujevuwod.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/641b663cccff480e1aec2da3de0362fb/gakopemu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=lord+of+the+rings+pdf+online+freePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001662e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1662E 5036 bytes
SHA-256: dc0119f5b390e0d6e86afcd560019ecfa4eebc195e2c37103cf3f7b13a4e9ddf
font_01_sfnt_off00017759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17759 13748 bytes
SHA-256: 2e7c89d862e76e0ee223710796cd068501690487932033b00afd616b6a76daf3

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