Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb0da8fecbe5a89…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 10:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 032ff9327eb580c02d14f23e681e0b33 SHA-1: 7f2e8a45ff3e40706588e3a1aaac3de4bb859a14 SHA-256: 7cb0da8fecbe5a89933792025365b7207337f142bb4f41e99fbb06e8f11f86cf
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://solarhomepage.ch/fckeditor/editor/images/file/jaxixujofofuxijolotojojas.pdf In PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/e622e76c77d6d8ea1e2789ba728ea509/xulowutowadova.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/5gmmp3t991ranvr5eqdpqidrk3/teperomomigusemejejujore.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/57629789977.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/91831947517.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc58aed947---xivadisawit.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/15338211129.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/sawuvoketudokibikuwaf.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/744656c0ef7bc0f9cf538c3f31d77775/7234604400.pdfIn PDF document text
    • https://onlinendttraining.net/files/jonumixapuposed.pdfIn PDF document text
    • http://dymenahealthcare.com//upload/fckeditor/file/58537853918.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/40055633844.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/1687046886.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210728_399DF66A37379F7F.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/79214937975.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160716fc6545bf---zovevi.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893e1bf3626---21278591407.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/xelosazenovevepubad.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/65081075280.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/214a8289deb30b75e9f18c996e226f35/18765977572.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5c69cda12---70298164731.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/95141264720.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210526081754964.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa06565d8---69260115472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=first+name+second+name+last+namePDF link annotation
    • 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_off0000e072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE072 10508 bytes
SHA-256: 9d79f684b267ee4e40ff298c1b60385f7506b53fac82c25f98e3f6e8bf739c17
font_01_sfnt_off0000f853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF853 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11065 17648 bytes
SHA-256: 58f98c51f5b150fc248f668d70acbb9a155fa6b4a10dea92e690dea401406992