Malicious PDF — malware analysis report

Static analysis result for SHA-256 bacef7e4589d43c3…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 21:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8fde7ff8054bfd10e62663a69f637d6d SHA-1: 41f8b463eacfd4534dffcf3cc88a8a6fed137b37 SHA-256: bacef7e4589d43c3448b23cccf99d85fdb8288d3d0346a4455a0c544723af9b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload, consistent with the numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=how+to+compress+a+pdf+file+size+on+mac PDF link annotation
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c07203843ff---78112268970.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/xokoziv.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b5ec10980---67732923575.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/zewenivurunapufemasebuwis.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/34f8od3ge7i4m8uhrko1dq1poh/fuxajawepaw.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/pnkonlqh4i3d9c3mbc8ie0t55g/41665093949.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/84070437e2d83a1c4eb5fd8d81f83d74/molesivo.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16082e99926f67---68810564896.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/81351091189.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/zejeruwoletokasusesil.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf23cb3b9e0---kejulipo.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b88ad3eceea---96147097505.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7cf29d1d184d6f256a38647b940290d7/63131060071.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/fixofazexesimesafabu.pdfIn PDF document text
    • http://apcmagon.com/userfiles/41478629034.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/jijozusukizimorebige.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/tisesufalarifetej.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/1615892620.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202108141309528342.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/xevewino.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/41931694590.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/3a8144029e6135c39ff7ba093c21fd05/mukenevopebuf.pdfIn PDF document text
    • http://falconltd.pl/cache/file/vimosawegomijula.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABE 10916 bytes
SHA-256: 2515c78f17f760362bfd9a7558a2517149fa9ee166fc8d987311f502011b4399
font_01_sfnt_off0000f411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C23 17168 bytes
SHA-256: 3b872daa7824b3a326889843f7d847932bb96ce53f3103485988732894fb328b

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