Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1562fc60dfe2ecc…

MALICIOUS

PDF

74.0 KB Created: 2021-09-07 02:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 79570d9639c1100e636610154d6d2e92 SHA-1: 406b0f1afe6c17361d10635a5531409b1f13dd13 SHA-256: c1562fc60dfe2ecc048838871ae1e4343e151cb1ec2fe06407845121e19a000a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised or disposable domains, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of link farms suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://cructi.ru/uplcv?utm_term=comparative+and+superlative+worksheets+middle+school PDF link annotation
    • http://gerastar.com/userfiles/file/puvulimuxevidevomeruzu.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a90e86520f0---pefozu.pdfIn PDF document text
    • http://jinohair.com/upload/files/83054338612.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/40275949005.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/7a2759562073e886fd7f59df79943f2a/37527510541.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/nubexekujoxen.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/1qqee7i8nmh4fln2ssb10n4rt9/bupiwamabefanagewanupufap.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f77b59b248---tepamebilepuperarowef.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/32313136335.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/f10d98aa45906b48b29cadbadf6f9704/damekupeloli.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/b100c5c598c1812dfac28c8ef30ca8ce/fawixegurojetuzoladivevuz.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/1797bef2f8a5d77eb65c3d1170cc1787/66579648945.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/xovajikototek.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/93359353835.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16258396189368.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/18923416450.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210703201725.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/a83cdiq0t60l666kpbh5d2nck4/2755890495.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/bb491ca9f7258dcc243cfc109f2fd9bc/vumezigapepojukibetik.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/13827762611.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610998af5e1a1---lisakip.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/74015750989.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/qb1vpedn77c49d4b02so6rj2hq/nidejibidix.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/73824831841.pdfIn PDF document text
    • http://livestocktool.com/d/files/49864812401.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/vudidexisugudenudez.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_off0000bcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD501 16860 bytes
SHA-256: 80dba6589c220741d0a27976053ff2b6ad3f4e857493cc8795776f0c1751607a
font_02_sfnt_off0001002f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002F 11152 bytes
SHA-256: 1bc1c5acd3bf47ae1417caddc3bfe0bed2808b4a663d863d62bc9233665fed14

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