Malicious PDF — malware analysis report

Static analysis result for SHA-256 482bf201141095ba…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 15:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d89aef6ba5f9739ee820168e1b083d4 SHA-1: 5e1db1d2802c1d5c1e1dc5b5c78d0e01fa18dec6 SHA-256: 482bf201141095bab202bafa4521377a2929a4c8a66bab0640cee04968ced7c6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics identified the PDF as a link farm pointing to compromised websites, many of which are WordPress installations used for hosting malicious files. The URLs suggest a phishing or malware distribution campaign, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crysiq.ru/uplcv?utm_term=bihar+tet+previous+year+question+paper+pdf PDF link annotation
    • http://veganogle.es/uploads/ckfinder/files/visumekegeker.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a192f0354a6---74863992958.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4204e0d13---piwudoma.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b09b272938---gewatulu.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/94042125406.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/33147143296.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/b24c31a5556d3e35ffdcdd13ccf46b8e/41839383326.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/91695516532.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160810ea5905f0---bidevuboguxoreturi.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/xevudo.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ace38018c4---kujof.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/c2806e7caafdba6bd955d77c05644d66/nezikatezopagunejexelezuj.pdfIn PDF document text
    • http://blatt-gruen.ch/files/rozurigipogigitesebuvig.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5892e3b4a---vutejabetugok.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/33951531987.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad4af3722f---kivudon.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/ad2ce2ed5dc9d1505e1437c38f007c91/vusujetonijopikete.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/tupajitobegap.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/b252f179fc34368d974d9216ad2ac668/380739000.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/jisine.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_off0000d492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA4 17648 bytes
SHA-256: 49db71812bc820ad552091021188a02adc42f8f79ba56aa2fce33480f2cc8403
font_02_sfnt_off00011a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4B 11028 bytes
SHA-256: d9ca688f27b0dba254f7deeedd3e29396604a5c3f5c4b1f173ae1fbe5718d236

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