Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5fd1d99cc09d76…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 01:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0cff9fd416136d3f3fcc477ea42cda49 SHA-1: d7e4b54cc88231e39d9715b903989c60effbb18e SHA-256: 1a5fd1d99cc09d76bde3895b820f724152a49a68e5d8767eb26825e27ca9070d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on such hosting. ClamAV also detected this file as 'Pdf.Phishing.Trojan', suggesting a malicious intent behind the link farm, likely for phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://philabc.ru/uplcv?utm_term=interview+questions+and+answers+for+hr+position+pdf PDF link annotation
    • http://ibb-online.ru/f/file/38073292977.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/gojosufititasunazomebuse.pdfIn PDF document text
    • http://abnicum.ru/files/file/kizekidez.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/kawavit.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160af978108ea2---vememo.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/tosidu.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/44266291484.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/34758948364.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/jevitokagejarikanotax.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/h984m7adf2393ku1a953cuppu3/35617712332.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609670d503fc4---92613468595.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/e958c74c9b84150103bd577ac7cb1938/jevijuvuju.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/80983d4db3db5929c5541cfb7ebe6b3c/rifenafelugazovimejiz.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a954768ee5a---82968589729.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/gawazirimozavemale.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/cdfe82d065d8e68beb6ca1929c8bdb11/65876689628.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb1628fae4---74207915168.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f226edcdd---jadijir.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/7e555a0156f8c5967e84509fab8cce9b/wulopagexazawukimisakaral.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86055d18d6---nowotivovipuvupaturivewo.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/guwuf.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In 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_off0000d8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F9 10896 bytes
SHA-256: 497c3fc63325e4a677afc8d502d4d676c26d911755171af667628c0b61df118b
font_01_sfnt_off0000f201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A13 17540 bytes
SHA-256: 9d7e63a068dff51bd26d38de66b810b7f6dc36ad740cf17a8b2b96da79c41358

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