Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f345e4f9d26d43…

MALICIOUS

PDF

84.3 KB Created: 2021-07-05 09:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5d835b8ab2feba9f28f3633e3c2b19c6 SHA-1: 2bd1d0b66e0cd8e3502e503a7f820019bf75e657 SHA-256: 70f345e4f9d26d43f5e69f2103685724b247c0d4eecf0ff71bc13f65cb55961d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. This suggests an attempt to disguise malicious links within seemingly legitimate but compromised infrastructure, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b38fdea475e---75807794163.pdf In PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a11d12ce8---43986608669.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/3aa181726f88ac10e32ddf91244f8af7/42644914102.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/88937789334.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/1942741242.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfda421a4e4---wijexurajifotedel.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/37qe5i7sv5fo0etihh94r497c0/levegewekosijovuxezobitij.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/litewasoronoduwoji.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/sozudagorubina.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/7b46b0ef53312f8efd478be3694ab81d/numamajixufigoj.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/bubidetefoluzatumoge.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/50001148133.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac781a7e9c1---zumepofevamok.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/jquhfpmqecoj0lkpu0tpkarou6/40184704338.pdfIn PDF document text
    • http://iphysiology.ru/upload/jelefazujurudunonifafen.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/sexabudoku.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/55586147990.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/1hneo66vroncq7tq38ml8tnk0h/lefitarukivimebir.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/xejepodatumezizivuti.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607fef2c94d37---kukeneteselevorozosen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+long+can+mice+live+in+wallsPDF link annotation
    • 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_off0000e9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A5 16412 bytes
SHA-256: 8e060976ce05bc10a8e35c3cb1ad88aa3a91608f6348bcdb0788576755e769bd
font_01_sfnt_off00011431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11431 10516 bytes
SHA-256: c74a69493febc5e7b8257e56185da1150afaaa8e731ad7095d3743f298858178
font_02_sfnt_off00012c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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