Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62442aff9fe2b99…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 22:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff667204c758a79d4c345da65c3c695f SHA-1: f61a7f32c18f115f363c3c8478fc7cd659707575 SHA-256: b62442aff9fe2b9917a5efa3b4d0460d589fe3400aae8772f00dc5ce6c48b252
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of external URIs and link farm heuristics indicates an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=after+anna+todd+book+online+free+pdf PDF link annotation
    • http://phuclocvienjsc.com/uploads/image/files/24186961401.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/sunevusezafitisebevuv.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613326867a2bf---buvulijojawawijefi.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/72031617370.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/rulawuridixamibukagaw.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/40704631002.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130e56663bb4---tufuwe.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/wafijeginokasexoraj.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecce8bf858---70600366998.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/kugafibupebuxana.pdfIn PDF document text
    • http://yulintimber.cn/d/files/38512187343.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/wunotavufilabil.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/selokoka.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/98631411231.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/41663677153.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b529ecd3c---baxime.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/33914820524.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/69920734715.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/vugitaxorakudekabosedipav.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/75133838976.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/wokekevewegabisikus.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/dogudiziberajilasazorok.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/wapape.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/46253731261.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/tixolotabonena.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_off0000e0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EB 18340 bytes
SHA-256: 4ed2c3fa124d22275ecf14b581621d99bf83c74b01b8ad6c592a164a74e45fec
font_02_sfnt_off000127c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C3 10536 bytes
SHA-256: f386a973eca3603ade7e4a07bb56929dbe99910afcae283d1d002f1ca66f66a5

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