Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cabf8d0b8dc65ac…

MALICIOUS

PDF

83.8 KB Created: 2021-09-08 07:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f6caee761726410c5c07441db541c1ea SHA-1: 9de67a70499acbfeb8fcff62c47e32632b825cd7 SHA-256: 1cabf8d0b8dc65acee7c9b6208eb6b6e5d8e47ff53678a78a55239cc81498df8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The numerous embedded URLs point to compromised websites and link farms, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent, likely involving redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://garglob.ru/uplcv?utm_term=marathon+electric+water+heater+manual PDF link annotation
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c34513d640---nasexuji.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/287e4096b199d9177f81f0b4e2f01803/31190837203.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/47754414025.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/mefofaposusixi.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/69264725732.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/33868975494.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160d51e01c3da9---jarelopaguf.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/70750615651.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/xovepozesunobajogurol.pdfIn PDF document text
    • https://tdfstore.it/file/57582362509.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/jorosemadat.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/jutijukigi.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/6e36ce5ca9e47e2cd26d6766d5886a29/90394363317.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/zizuwariwinaba.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/48ac16aa52786488ec513a2ea3a338d7/padajuzejapuvona.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/98803660494.pdfIn PDF document text
    • http://hrudolf.com/userfiles/duvuwibezasapebeworakol.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/jebox.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/32b82f45344c9b54c43f5c0752381015/67437130813.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/38863428975.pdfIn PDF document text
    • 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_off0000e256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE256 10508 bytes
SHA-256: 39a8f757dc981b409323b96052c202eda923e2e50820d3887ab99bf34016c3d2
font_01_sfnt_off0000fa11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA11 18156 bytes
SHA-256: 13982f5d36aa6525f0b76301bf83fba647a11167c492d29aaaddeb0479485165
font_02_sfnt_off0001293c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1