Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfcff00ed9169ae4…

MALICIOUS

PDF

91.2 KB Created: 2021-07-01 22:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 286de5db111720507c8f35c24902b05a SHA-1: e18f864d1a4dfc49f001f0bf175bc88f541c7d66 SHA-256: bfcff00ed9169ae4ec27cb1e43c24dd90ef7c906d47084638fe1c89db8037f8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=absorbance+of+potassium+dichromate PDF link annotation
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/280130d59e3055b2bf57db289223338e/sonevupigi.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/57196152579.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/84464121681.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/vakesezedubexavabojuj.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/usta4a0j9a11h4k9keb3jhluli/25120251134.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/55200826168.pdfIn PDF document text
    • https://triosms.com/userfiles/file/kokuxapaxebelegijer.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/74dcb45bd0ad2384bc1a32ed2afc3879/1243576740.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/e3c27cc2162c7cb58b2d26695f8bc0d4/83810142723.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/7d032227b5839a1f32c36db9a7ef6cc5/vitabowipi.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5ebbf8b9---58191367154.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/najasarabad.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071a44a9e012---fitev.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/fowelagitat.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/warosoje.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/2no6ca005ulg2ppa21p3rro5s5/80189600615.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/91669437904.pdfIn PDF document text
    • https://faprosid.com/file/navalupij.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/b656326f3ddf3ccf21bebb97b867bd5f/21995761872.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d7b824072---sesitulol.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/kcu60rpk5go2h3f5c1ds2tj64p/41102556131.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5d47f0db2---11250544556.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/93106030960d2bdff85259.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_off0000fab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB7 11060 bytes
SHA-256: 6840dde7a70518801ca4bfa4435be9ae83147375950f1384ab26e2cf50be1597
font_01_sfnt_off0001141a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141A 19320 bytes
SHA-256: 7aa2347f2d2803f94d5d59d16fbdf15d55d4b3c7c3437285cc99e574dad08d35
font_02_sfnt_off00014767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14767 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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