Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58f83a9357a0660…

MALICIOUS

PDF

94.0 KB Created: 2021-08-11 14:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 10df4bbfad6f2057be52df24c495276c SHA-1: 28c8ebc51eb722dd3d8cac15c130397616ea4305 SHA-256: c58f83a9357a0660f22c1e4413d723e6a83af49cdae4d43fda023a9cb4b4f9ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary function seems to be redirecting users to external content, likely for phishing or malware distribution, indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=how+to+win+doodle+jump PDF link annotation
    • http://patp1ryb.ru/media/file/kagezebaxibijos.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/48232730040.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/l3ocnkag2v8vneg70e7657dl6l/22942518107.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c4682c91beb6041705ada540c8764bfd/zarubiz.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/3bffe8cf459828226ea4bd10f32f3d8d/69741512826.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7704181f8---94041021117.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/5422760281.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9332d7b49---71530146026.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/pisibeduparokolalizag.pdfIn PDF document text
    • https://gamasteel.net/userfiles/file/70308999790.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/3o89rtbks9bd44ehjgs46d2qdf/geniwetologukarisumakuzib.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3248811abb---63703396810.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/fadusuzagafepeweza.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/86297497645.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/tukezezuvazowuvevove.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/nufeb.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/54439980742.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/88910921553.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ada04eba2d9---87893641205.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/31842284045.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/f6d4922bf9060a543befb2cdc5604b4b/buzesujobudad.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/70250101456.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/25599297664.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10954 10428 bytes
SHA-256: 5350ad0b3ff4d5b7016b32d12bb645d87578b4f2c8a60df399449edba7e6b5f8
font_02_sfnt_off000120d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D6 20028 bytes
SHA-256: c6d520159c899286a15227ebdc95bb9a156bdf0fc6fd50ca9f1959fa3991bc43
font_03_sfnt_off000153e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153E6 16304 bytes
SHA-256: 72b6d5534888ecec27fd68dccf88827b5fbc3510db23809d90398b76a33fedee

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