Malicious PDF — malware analysis report

Static analysis result for SHA-256 31279d70e040a395…

MALICIOUS

PDF

88.6 KB Created: 2021-07-30 15:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ea5dc4b542fd100c2b6fad4279815f73 SHA-1: c97150db7add76f2b510d73a836aff5a969d2053 SHA-256: 31279d70e040a395ae5ae9ca9ce08a3ac3bf1c4b53fa1a89b19e9e8f8d4be5bd
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 pointing to various compromised CMS upload locations and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farms indicates a likely spearphishing attachment vector. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://akapacha.com/userfiles/file/60162128701.pdf In PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/7358fcbef087055aeb557860bc3d06af/57034121662.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/jeweku.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/648eebd94a83f03d0679dc7994e4e65d/76842018402.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/82772844856.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/rebomikaranesinowapuk.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bac800915a---famisatejagasuwapoxevadi.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f7513cdc3a6---ziwoterejigipowedujodixu.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/39958650555.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/wijadajobixu.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210614_D035BDE31FB516CA.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105260958.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e3ebda7c1---58867550893.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/da4170ecae1c3bfe9266118271ad04dc/dibawe.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/022325531348.pdfIn PDF document text
    • http://fructusartis.com/i/File/gesuniborilujabi.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/6650297588.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/64eb1a6293e3451a8d8ac50967e15054/vezifubikum.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/jpuc9r2opm2rtj9pljlvir2ba2/79032430705.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/bigomukukilifenorodemilon.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/n4ql4vrd9r54o22i6hqrkh1jde/12081189755.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/risisubekifobi.pdfIn PDF document text
    • http://sparkpro.lv/content/file/73258183598.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f21424f580---wibatoz.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c7e917880---tativepogitame.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/miremutirujebutedojelelu.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffde9a4a02---1335141972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=oz+the+great+and+powerful+full+movie+in+hindi+free+download+mp4PDF 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_off0000f457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF457 16948 bytes
SHA-256: 37afffbb4fb100ee98e11817c83eafea4ecd64ab604f93540cc70bebd1981c44
font_01_sfnt_off00012097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12097 11192 bytes
SHA-256: 105a167c6644b74ec5d0c665eeff561759821f53b47afae186b2a41b430774a6
font_02_sfnt_off00013a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1