Malicious PDF — malware analysis report

Static analysis result for SHA-256 1079b14ad561acc4…

MALICIOUS

PDF

109.4 KB Created: 2021-09-05 16:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8e3028f858c0685c4f29dd5aa1a9d3bf SHA-1: 137b139df8628bd12ed2a77ff08a876fa0160737 SHA-256: 1079b14ad561acc4aa27414a7d5b879c405bdf464b2fbd7609dd2f7b9a756f82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ketchas.ru/uplcv?utm_term=constitutions+compared+an+introduction+to+comparative+constitutional+law+pdf PDF link annotation
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbbfe4be67---libofawekadegabug.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/lc4j31an6rbn726tqt7c55h083/wugena.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/4ed33530e5876c8d7136269df1915676/51312452102.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zisirav.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/40982010596.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97c8ebbab7---41501526294.pdfIn PDF document text
    • http://mamitobe.ru/files/file/ralanufusuzuxula.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5af4b6e781e70695bd3d1b43f013d0ee/93165749115.pdfIn PDF document text
    • http://langmypham.com/luutru/files/rinasefa.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/th0lfvb6rfeb7a4799bkperhgb/vikutizebimebedew.pdfIn PDF document text
    • https://alutat.com/data/file/xiliwogavimijadivo.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc301bd9c7---zekifajerok.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/zugamagipowusi.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/f6c7a278a68d5a5e33028d98c7aa3b5b/kimagizuj.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/66065514038.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/186a82fafc6e92271159bf5fee81e76e/93647953701.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/pavepazitazub.pdfIn PDF document text
    • http://azizolace.cz/images/file/gozetikoxepajinid.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/mibenevaluz.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/vukifojalesebilir.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_off00013fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FDD 11064 bytes
SHA-256: cf3562a1b5065469d11621bdec914c06112ed0a1fd824d7e1b593cebb88b17e7
font_01_sfnt_off000159b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000171cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171CB 20440 bytes
SHA-256: 7687eaa50aef8df480054ac14dc5007453ad86c3415cc4788b67dcc4128d13dd