Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d0f0cae2c15ebce…

MALICIOUS

PDF

78.9 KB Created: 2021-09-01 10:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 599d82419d84a751af9d8ad26a1ba06b SHA-1: 8cb06974fd8997fddad68c1a5c71bede2ff429d9 SHA-256: 6d0f0cae2c15ebcebb3b3bbc53cd3b51d0167ab50533cd4cd517cce04e76f0f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript may be used to obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=central+veterinary+clinic PDF link annotation
    • https://www.ijdsir.com/ckfinder/userfiles/files/togamowifalububitudib.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/43375186767.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d4c6cfb63---85157785994.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/gonuxogiwepero.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093b3f0b7fd4---13518867603.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/sabugevega.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/74271602348.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4b87929b7---xebafukarigopabisose.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/titituxoleruwaxalob.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/49240243074.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/5087707263.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9c60e137b---44196104976.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84fd3195c---tawiketukiw.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906959142af---xogikoxuvasalis.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/820403c5500401f22362f3dca1a4b643/zefaxine.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/b4bed3grb3pe1q10fqlqflhlcs/papotizanoxonuzute.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/dajedizejepekaz.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/rorujasim.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210803180549_zkhwkv.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160774a628ecc7---taruw.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873b6f4937d---motegazuzekibekadenafo.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/voferewoxijalojifugoz.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/57806046601.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_off0000d36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36F 16760 bytes
SHA-256: db59427ab4a28618f01b87f0755d1b0eda98398d66b468956e89fe34d772a0aa
font_01_sfnt_off0000ff2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2F 10144 bytes
SHA-256: 64477b2d6b93326a63fd31c602c48fb67649138c54a17e5ff55a340596f8c76c
font_02_sfnt_off00011602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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