Malicious PDF — malware analysis report

Static analysis result for SHA-256 054f03b473a193c6…

MALICIOUS

PDF

79.6 KB Created: 2021-09-16 19:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad4b7979f2123ee2305be12d871a613d SHA-1: a15c9d6ebf6ff7874259e07eefda1db318546b4f SHA-256: 054f03b473a193c6a82fc7b07fb99755b2b0f32e28c3ed9345f38c37ac3d0322
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://allytemp.ru/uplcv?utm_term=house+of+fun+free+coins+cheat
    • http://speckrepej.com/upload/file/xukixowugotekoxitunesu.pdf
    • http://cissud.com/uploads/ck_editor/files/fosokoseripuxukenawepar.pdf
    • http://kamnitikamini.si/upload/files/66923945095.pdf
    • http://cgpreceptor.com/ckfinder/userfiles/files/levubafijiset.pdf
    • http://huucodatlanh.com/userfiles/file/28758597731.pdf
    • https://ibexquimica.com.br/ckfinder/userfiles/files/fetofebedor.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431df8e99fe---49252655372.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132844476d3c---61991439612.pdf
    • https://contact-house.com/fckeditor/upload/file/86831145579.pdf
    • https://dyaa.club/uploads/file/dubejofikibuxazo.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/b7rleonuoik3nrvh84o7h7vbe0/63166582162.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c1a89ac70---78140054060.pdf
    • https://perfecthospital.net/ckfinder/userfiles/files/89579504219.pdf
    • http://taaltoetsvo.nl/userfiles/file/49967629418.pdf
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/93588820088.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140962c9ac8c---97758654414.pdf
    • http://agnieszkapawlik.com/userfiles/file/jujisamesorewe.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/75bf617ecf8faa44634ca4517b5d8eef/1553548682.pdf
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109110807489654.pdf
    • https://hfbee.tw/upload/ckfinder_temp/files/20210903051135.pdf
    • http://ainut.fi/userfiles/file/41939047612.pdf
    • https://sssmri.com/ckfinder/userfiles/files/48990024505.pdf
    • http://klm-co.ru/foto/ck/files/95389411583.pdf
    • http://a-pluset.com/userfiles/73546164242.pdf
    • https://5ky13lu3-1251.com/contents/files/kokijibutakuxufo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FF 16792 bytes
font_01_sfnt_off0000eb16.bin
00fde6c8ab126c5c1135dfc1546fa0be77fc5b2a0a73345f4d97340269a7a19c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB16 10476 bytes
font_02_sfnt_off000102d6.bin
93cdbca22f459ed38bff511b10e06dd8caf5b7d11c9e71980adf529f38e252c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x102D6 17728 bytes