Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25a7bddd2e09c2c…

MALICIOUS

PDF

84.5 KB Created: 2021-07-07 19:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 36e822d8c0038d7da7f80c9496f9750c SHA-1: b6d964a33df59c1a6d5c7627b69b3de3cbbe9b71 SHA-256: b25a7bddd2e09c2caa4e5051bef7844f849a968141a8cfb4709b7b5116ed24bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://nomylo.ru/uplcv?utm_term=cost+to+notarize+a+document PDF link annotation
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b163a9b6919---13258762564.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/xuluboxixovov.pdfIn PDF document text
    • http://taniaandjohn.com/clients/874109/File/55318502832.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106212149051288.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d93d9d02f9---napenarogan.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/5vtok65glgb8u7pfv8prkdjqd3/16427337266.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a90b0e8812f---5711048666.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/rvrh0q9nudvomjb77h3l5qtma5/zisoruvinogowad.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbbbb69193---12595490546.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/45732986407.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/xazewakepevobob.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/dakixuv.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/7387096097.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/ginosasezevarurajamape.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/fesebufosinoriv.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/613932935a64ba21b96806315e7dcc5b/pizipavorixogirekadabi.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/1623261684.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b9d9514b55454b278d47237acd3e06eb/ketojamoram.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/88962924999.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b30f3f8b4---larodazoxu.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/e89210a2b821a68038fc012de25ab124/fexodoxibilumosax.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/boxiledewekegedabodot.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_off0000e7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FB 17024 bytes
SHA-256: b3131410520f36ef2b4d6e913629db0a2e9bdc08afd94f247e576b03d8452781
font_01_sfnt_off00011490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11490 10676 bytes
SHA-256: 751b00b5f468deb4b72de8a9d585e8e980d8c9724fc44371189ce2904d4474c5
font_02_sfnt_off00012d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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