Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3eefc4425a03976…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 06:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e557d6457ef58c10475cc48d6f3cd124 SHA-1: b5d56e3120839caa8eeb5f9be89b43d7a9b9386e SHA-256: f3eefc4425a03976a460254bbec6f4e7b44c570f02856773fac48947d44cb461
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • 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://garglob.ru/uplcv?utm_term=revenge+2018+full+movie+english PDF link annotation
    • https://texigo.tw/upfile/files/2021/09/02/lobarinowubu.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/80412941698.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161336d5696d9e---supaburoxiwugevapo.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/zibifatenaxitawodebuvow.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631328947_1.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/gawamigefiwe.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/58375855144.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/35553279505.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/71323850364.pdfIn PDF document text
    • https://hoalavender.net/upload/files/96911344164.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/gorasilamuzegunojuluduful.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/76607327207.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/tuxavezivobubevulodujep.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8c1f3e06a---66924799551.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/fetirejamun.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/pi2rl87rclk26jrbe4q063tdsa/xofoxisedivufesonuradunub.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/76873262639.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/44152966041.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/fusexad.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210901_211451.pdfIn PDF document text
    • http://rc-modeller.se/images/file///89382471043.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/42652874086.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109110607066183.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/17108151384.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/21052963562.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/16791895527.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_off0000dddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDB 18888 bytes
SHA-256: 5c89191c725f08207c2dd7b34800653fd7599b8c3573a4e58d0eed7fc01dcba5
font_01_sfnt_off00010ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA0 11012 bytes
SHA-256: 8a08c4bee599fd8ced3055019b2c0d20f1ce666d0a3f9e8fcec55b72be81756a
font_02_sfnt_off0001282a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1