Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a8dc85493309d5…

MALICIOUS

PDF

83.0 KB Created: 2021-09-20 06:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ab7962ca0f6dac0b6e4543dc740f0868 SHA-1: 56ee824e27f42c7fb83ae8607b2d56eb1b6005c7 SHA-256: b2a8dc85493309d59acf8016aabe3ac0110ea642d5faa8cf82fa2f8d5db27ec4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is detected as malicious by ClamAV and an ML classifier, and heuristics indicate it functions as a link farm pointing to various domains, some of which are hosted on compromised CMS platforms. The document body, though heavily obfuscated, contains indicators consistent with a QR code lure, suggesting the user is prompted to scan a QR code. This likely leads to a second-stage download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://huntic.ru/uplcv?utm_term=scan+qr+from+photo PDF link annotation
    • http://mientrungland.net/uploads/image/files/59019114157.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/48929475ae0a7c78d3d4b85c5d52c3f4/zanuvifepibugabomape.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/78252505760.pdfIn PDF document text
    • http://btfa.tw/upload/files/bezidi.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/xugode.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/80916520551.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/fosojufasowedoxojekaveze.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/fukedusuwitupikakojem.pdfIn PDF document text
    • https://posh.hr/files/vuduge.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/e7402c5802ded36c703b569f7484ab2a/88745551403.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613eee33d9e09---mirisufujol.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/ruzogidonobitofifokevo.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d27b8c732d---rudakolemowi.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/6e5eec66e23c81c2f75ec3bd7e66f1e6/rakibimanefavosoga.pdfIn PDF document text
    • http://ktcz.eu/files/files/xomorugitinudafi.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/mojiwujijumejadepeveniw.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614093351ef2a---duretidowibof.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/99871674329.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/wufexalebupugazus.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/zetiwinolixobijezarevo.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/nojeve.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/89117261926.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/82407780061472787a9155.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/78645795599.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_off0000e2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D9 16936 bytes
SHA-256: 756ac311b244ede79031eaa41de479ab6026485fcc8392a62dba1891d3bae2f6
font_01_sfnt_off00010f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F03 10528 bytes
SHA-256: 84940930f17a45d14742cafbd5ae9e7af2ec9e287673a5c85ded1a01dc63de9f
font_02_sfnt_off000126d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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