Malicious PDF — malware analysis report

Static analysis result for SHA-256 c303b25c00d4e26c…

MALICIOUS

PDF

81.5 KB Created: 2021-09-10 21:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c92cab961b4f6ff05e12b3ddac1c192 SHA-1: e0ea465ddea58b0df73d72e54ef21becc502a91b SHA-256: c303b25c00d4e26c2cf396266345ebd8683475c02bbd39b3f6111dfd153cc7fa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The presence of a 'Password-protected archive handoff' heuristic indicates the document's intent is to trick the user into opening a password-protected archive, likely to bypass security controls. Numerous URLs pointing to compromised CMS uploads and disposable hosting suggest a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://catamma.ru/uplcv?utm_term=ex+file+explorer+app PDF link annotation
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/e7dd822a6a55fee0ec99bd241f34c97a/23425889180.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/xoxiwagokuvovagiw.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/pepinukuveseborazajamew.pdfIn PDF document text
    • https://hinaweb.com/upload/file/88336776309.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/20471455128.pdfIn PDF document text
    • http://edallyshop.com/upload/files/zexosivigugipe.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/rexige.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/favemufivuxugediji.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130520c4882b---63415759803.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356d924af6c---36140021127.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/73558871277.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/41852849453.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/kutibexusatizigov.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/52059434491.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/43311126375.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/lmnd3ur6cgfi4j24ba6nmbkmdc/16924373235.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/42429921042.pdfIn PDF document text
    • https://rosycaffe.com/file/jirajelazutadaf.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/minagogewovowewu.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/50628589376.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613509327f6a3---55593409486.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/qdp15maj7h2cjeir2caujn9gm1/76114708429.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/9066067566.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_off0000db00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB00 18080 bytes
SHA-256: 457bf8b885d8e31b4f2fa31ccc3e995001b36d5333e57dd395bdb6ff4b356b2e
font_01_sfnt_off000109f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F2 10068 bytes
SHA-256: a88ad51502072ea4d1b3eaeee7f6c2e627c52acb99e3f4abb2cc28a0f97255ba
font_02_sfnt_off0001206e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.