Malicious PDF — malware analysis report

Static analysis result for SHA-256 5832e5239e3d67ba…

MALICIOUS

PDF

122.2 KB Created: 2021-09-08 15:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: be289cdbca5df18c764855d4cc4808fd SHA-1: 3f13d4bd612507348107b4d3b98ffe8bfdfd9f3d SHA-256: 5832e5239e3d67ba4cc7b6a7535e4e008d2bff21ab19f2b0a88e5dcfbc1cf472
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://decamiones.com/userfiles/file/88203010111.pdf In PDF document text
    • http://www.cavice.fi/tiedostot/files/ginezizulubadimularikona.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/77607310288.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136628873794---74497370745.pdfIn PDF document text
    • http://futboltotal.net/images/files/62682801022.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/ronukabufopegivojosubo.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613125848bc43---sulukajidepevozam.pdfIn PDF document text
    • https://noddy.nu/images/file/noxisegupokesatitisobimu.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/96029756578.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/pafiduxivumuvewuzejam.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109071001299698.pdfIn PDF document text
    • https://abss.pt/userfiles/file/25674597065.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/wivubuse.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec63f8e635---jojamamepasasodurar.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/68787265417.pdfIn PDF document text
    • https://masihpt1.com/contents/files/mogefanabawegawafezofi.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/60641355257.pdfIn PDF document text
    • https://renetravel.ro/images/files/95794047907.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec27b2b0cd---gunixuwiwekironututojizuz.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/u5s03mhpgq5hgc85erso0qcdqj/7610345138.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/61290196884.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/fpdp44g0013ht1p620jfrrvhvm/jorigajubezevu.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/12517716335.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/43232485412.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/q0k11rfo0791i4mjdgnvbjk6ec/naziwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=statistics+for+dummies+2nd+edition+pdf+downloadPDF 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_off00017888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001909a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1909A 18296 bytes
SHA-256: 97abe8292ae9828de0d824f4ed5e604e7eed70ab4dee8876c6f42c67b4f71fac
font_02_sfnt_off0001c02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C02D 11164 bytes
SHA-256: ebe89359f11566d1453a25ce769b079247e41963f989d4bd5ce2c88d7c958479

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