Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4221af112b747de…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 02:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9ed04b874589d7cf682de255746cfc8a SHA-1: 6b1400010e7df2c71758ef4f99ad12e8ad614364 SHA-256: c4221af112b747dec7ec243515356bd3ea19614b7b394c0617164a0863746172
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing text but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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=how+to+change+message+tone+on+android PDF link annotation
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613591a41c83e---muxonivev.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/foteziloguxamupuvude.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/biwemuxu.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/qtn84a1vrt58n0cvfc3ehe23s3/22826456592.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/40868161921.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/luvanodo.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/niduguwa.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/xufif.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/defijazafoxapinidoxize.pdfIn PDF document text
    • https://ayurmitra.com/files/file/49181178091.pdfIn PDF document text
    • https://aromamarketing.md/img/files/wopugu.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/17715109972.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/tomupuxotilavamaderuxog.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/wivifudosutexur.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/kebawewomolidu.pdfIn PDF document text
    • https://rafautama.com/uploads/file/66475219599.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d96a953855---68526899399.pdfIn PDF document text
    • http://herve-coiffure.ci/files/zufumo.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/fezij.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/88220423873.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/matovekibib.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/lidapuzovesozuxunof.pdfIn PDF document text
    • https://unitjaya.com/contents/files/wapiwiwiki.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/4500820323.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/gewinafubimo.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc564e8ab5---mavugisujojifez.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_off0000d92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92D 17720 bytes
SHA-256: c598f91c64eef44d09c8f6ba7174f120b8492d375434102815e58c0b4dc0586e
font_01_sfnt_off00010789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10789 10848 bytes
SHA-256: abc587891c32cb8a2dabe887fe372f1d57a9e11da2438162431df40233a16c87
font_02_sfnt_off00012035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12035 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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