Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e11ad9319631fc…

MALICIOUS

PDF

83.5 KB Created: 2021-08-02 02:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a84e486b2368f65a4c936b53727073fd SHA-1: 5e29718ab7cced9f058074978bda80f830b0a534 SHA-256: 82e11ad9319631fc7eada103446f561cac3e8c5b9c4fd9c4f2ac0f4593414ea0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised CMS upload directories, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL findings are sufficient to assess its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ckrestaurantgroup.com/ckfinder/userfiles/files/febojo.pdf In PDF document text
    • http://faurerom.com/userfiles/file/81258545752.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/gotuzos.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/qui359bbq6ijee83d1v146cc6o/tibakizavokasuzow.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/fotomurinamagos.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/75b7c6fa24e7b2c393da4206b9971754/kemimusiwimene.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/77169430169.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/hf0m6q7o3g427tpk31obu9rm99/29558519033.pdfIn PDF document text
    • http://islandpointfl.com/userimages/35540625243.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/wenotagisakun.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fffc24fcf7---xixojunawinizuvamefoti.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975dac9087a---lanebatasewapepadod.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/0b7922e7a5c44ec109a702f44f95020a/62512378200.pdfIn PDF document text
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/tavugodipovadutib.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/6780747508.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/vabugug.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160e79d1622fb3---zuxidikim.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/4f0b583819a44d146a3f3358377291d6/mopibeb.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/47279274679.pdfIn PDF document text
    • http://dzbnf.com/upload/file///jalobekovosapata.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/52316750077.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/vanisegis.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/028243e6b4f1c89d8cfede756a509e3a/xafebedikulotimifoti.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/mnr1m7ps39dm02f2e1ka774krr/68010142462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+patch+adobe+acrobatPDF 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_off0000d72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72D 22384 bytes
SHA-256: 4bca9ece877c750820dbf45a27b23139b7f7b02e3034f7d501fe1c48166bf21f
font_01_sfnt_off00010ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF1 10420 bytes
SHA-256: c4ddbbcd765b2c997ba1e4e34d82796b1bfe84a9d74ebd727affd67e4b36489e
font_02_sfnt_off00012676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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