Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7e457cf1b8b29f…

MALICIOUS

PDF

71.3 KB Created: 2021-10-03 22:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7cfb15a7bd0e96c595586da91ff2d7dc SHA-1: 5b14d6ee94eca26922bf290d839f4ea4f44e9496 SHA-256: fc7e457cf1b8b29f094241a2997620f047af4246f5ba77a19cabd167895fe81a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript may be used to further obfuscate the redirection process or execute additional malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=sliding+genioplasty+before+and+after PDF link annotation
    • https://optical-axis.com/uploads/files/202109250408431897.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/672900698.pdfIn PDF document text
    • https://elearnhouse.com/userfiles/file/xunom.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/3521105276.pdfIn PDF document text
    • http://ewtch.com/upload/files/dogazifikoporaniwaro.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/mojazagumebep.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/nalusado.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/tonisobexolat.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/d0ibi2fts281amjthqdele8jm6/mevololezigalumelesazalov.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/98821573679.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/famigexejexapotak.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/12549868082.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/95236407738.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/8062024304.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/225ce5f935472e9c492c14efacd90a11/lixoteranemoramim.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/98038370454.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/6ihmnkibop6456rmstp13sfk47/bepopegelifu.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/peniko.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/pipogekuzolivafaburi.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/28323074772.pdfIn PDF document text
    • http://thepducphat.com/upload/files/72914646831.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/77560928189.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/vemugizu.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_off0000b193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB193 17440 bytes
SHA-256: 000bd6933815c3820767c97b1b9100fabd55bb9a6301e438ccd27dbfbcfc1275
font_01_sfnt_off0000de51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF668 11004 bytes
SHA-256: 79c84b567800d0fd41e49016521661f63d2be9c2cfeeecfd95547a7b7bcbd048

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