Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ffea18aa788bb23…

MALICIOUS

PDF

85.8 KB Created: 2021-09-17 23:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: adff10b34ba020e3b4c626007b5f7948 SHA-1: e019fe2ea1f0d51b797caf16203bd0094c4462a5 SHA-256: 1ffea18aa788bb238e3b74e5e486aa50ac33169036e8d2fde8c4b80d6a2b2ea4
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous links and the use of UTM parameters suggest an attempt to distribute phishing content or malware.

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 https://crysiq.ru/uplcv?utm_term=flashing+light+on+android+phone PDF link annotation
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/eeaab4dc0c6e62ef02e28ce8e6d98e96/tajerewitil.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/50395686250.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/59194184935.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/68696104877.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a82fd5d653---fosavasufuxulumon.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/51581068696.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/gexera.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/99653774684.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e03d30d5b5---vejokara.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141f22653911---54282810079.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/33857753520.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/fikipudivukutetipazal.pdfIn PDF document text
    • https://aleemanschools.org/userfiles/file/53198671242.pdfIn PDF document text
    • http://metallpress.info/files/vidogifup.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/siposegigiku.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/3c47c5dc89fb8133572235ac15fb2337/97483427113.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/22937602794.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/26931303822.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///vunisezasitojef.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612eed6e42131---6542583197.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/49779351439.pdfIn PDF document text
    • http://neteyes.eu/editor_up/89737165564.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/78731299859.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6b3cf36d2---muzubasetitoriwik.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_off0000eae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE6 17620 bytes
SHA-256: 88f2f212ed9387c29549218d6607502e1a90f957197d46b97fceb4fe7de3f128
font_01_sfnt_off000118f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F7 10648 bytes
SHA-256: a892b35d708ae3fa4aefeef43bd83ee7e01346e3ef3e7637420744b814b8c54a
font_02_sfnt_off00013107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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