Malicious PDF — malware analysis report

Static analysis result for SHA-256 1289dc2517fdf0ba…

MALICIOUS

PDF

84.5 KB Created: 2021-09-02 00:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ba4cab4a86c691250340cae322bd1729 SHA-1: 9638efdf01d8c3ccb6ccc438bd77c9e660aeb2ae SHA-256: 1289dc2517fdf0bafbf52c310dfe958b8a9acb43d252d9373542d4e0e24dce10
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious content or phishing sites. The presence of external URIs and a link farm indicates an attempt to distribute or host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nomylo.ru/uplcv?utm_term=us+embassy+processing+times PDF link annotation
    • http://a-xian-coat.com/uploads//files/202108042105072169.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/wixag.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/mexomawuxa.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/393109533.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/6712d83075fe22a8cde37add4bfff7b1/18193002121.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/zivinujakenab.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-02/images/files/92680244904.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/tusetewobodun.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160832e963773f---navowapajor.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/931bcd0f4ba6da2955918dd427a08f58/87575438031.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607587ce82678---sesut.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/89875075882.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/tikam.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/bfc619c1628665371095b17cd14966ca/kijotekovo.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/67581387870.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/zelorapalokikubefojorose.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/luderoremo.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/dofuwamug.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce585a88c8---82347782917.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210815172552.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d5f40d583---kesidefasusuxesekijenemer.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/dezusiduwozo.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/rifironexam.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_off0000dfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB5 10932 bytes
SHA-256: 15615cd0b36b7325bc750bc88848cbe84a7b8fb6ba440b7f20b87e261f5b856f
font_01_sfnt_off0000f8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DA 19624 bytes
SHA-256: 645cad27a536823eb2f08d471e9c01e28943eee614f9b88f29a955b37f620e13
font_02_sfnt_off00012be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1