Malicious PDF — malware analysis report

Static analysis result for SHA-256 a624e8dfd14d8581…

MALICIOUS

PDF

90.7 KB Created: 2021-07-05 20:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8b17e53b867bbb7f324ccc48ecb9f2a0 SHA-1: 26c841b5382bb17b4f663429511856166c307584 SHA-256: a624e8dfd14d8581692a334ef24974c8a5a132f1ed1615b10dd913f1686b2c16
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The 'SE_INVOICE_LURE' heuristic indicates a potential phishing pretext. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to deliver secondary payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ketchas.ru/uplcv?utm_term=accrued+expenses+in+accounting PDF link annotation
    • https://profipreklady.cz/www/ckfinder/userfiles/files/73385140998.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/je5or118n7hdt4stup8bfm7jtn/32952285465.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/20994101270.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/68842501972.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/74fadfd5fc930bf7f7d564d4f6463dcf/dowuzasugofedavev.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/dowotanabagevipinuxapu.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/jetanexeteki.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dcf5ee4cf.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106282336384234.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/24733533484.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/55b5b55e2dad10038fdc626177f9bcbe/bozutilulewozamufajonuza.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160982f9fbd0d1---957253090.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/bh8u29tc75f4pdn39ie5361k9v/71111795623.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac16b12fbed---9862294826.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d9d0441dd---geguwu.pdfIn PDF document text
    • https://kede.org/userfiles/file/setuwex.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97a1aa1464---semejijuv.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160851f12073fe---27234907608.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bde01c5141---43330913435.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/14111420988.pdfIn PDF document text
    • https://juegosinflablesarizona.com/files/51221162484.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160751fd500ac8---mijikepobejumovazetimukuj.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/f9894910a5a69590b0a9a990d44d1da1/xelema.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad936a89265---54528325418.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6eec77c27688fb11c474839e9ebaf6d8/44941133289.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/f4025629631125f68dd33504f9419217/gigon.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38C 2612 bytes
SHA-256: 3a1307a9e51012f8bc77f1c6f111748c9def541263f6c87c301d016093721792
font_01_sfnt_off0000fe84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11696 17384 bytes
SHA-256: a63629dd35d6b983d677d11aa856803b4aee53782e2156d64489963b326e8856
font_03_sfnt_off000143ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143EA 10824 bytes
SHA-256: 54b0d57139e636ea41f0cbac30eaafb43ad101982c27d869afba7364286318d6

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