Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a372520a1ac524…

MALICIOUS

PDF

83.2 KB Created: 2021-09-23 02:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 50da5a1727da8ec115d09418eb9e2077 SHA-1: a0d14d1a8ba56009fc956ba1585930a1e50f3e7f SHA-256: d4a372520a1ac524d0144fd419d7f519558bf5f7614dc0916cda36a9ae86a4bf
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 part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://oniceh.ru/uplcv?utm_term=my+phone+closes+apps+by+itself PDF link annotation
    • http://kechengchem.com/upload/files/10840171825.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/5utr8b3v2691c1hl6io64v0j15/gigibodo.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/34775665690.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/lezupezimamasujujis.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/vipokolebu.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/8874538922.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/kirinapu.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/zoberuludaxitutuvula.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/tanefasokilenalamijemon.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b6bded0f0---19203995301.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/60d91a32cdcf630fd3d0ceaac741f63a/69874613274.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/698a7b93d521b8a7dab4b31474b746c7/fedoluvotomomali.pdfIn PDF document text
    • http://grancanariacomercio.com/documentos/file/35822699865.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/jeladukukukuzumupagiw.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/vetepudegugibuda.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/54981788194.pdfIn PDF document text
    • https://ttablaksystem.hu/files/file/xuruvezupiwijemomeberapo.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/vetosofimegogunig.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/jumomavatofagifumo.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/nebenezomawuvuga.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/kimuxab.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210912_2231DC568B99A31E.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/9bbef4ebeb694f7d9eb532e2f3eabc39/fepawufutufozagoki.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613793cf1c019---1126659674.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/55193950195.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8489362b0a5971220e513944470d35e9/45308144161.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/87578097244.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_off0000df7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF793 10724 bytes
SHA-256: 2deedab2ac108fc3182d194c4c2345528b5e289d7c247424a2feb5b6a4ed9a38
font_02_sfnt_off00010ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF6 18036 bytes
SHA-256: b35d53a35ff59b05ed53759c2fa56aa1dc827c9a5712db9ce592e5b458fcbd41

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