Malicious PDF — malware analysis report

Static analysis result for SHA-256 750165a1cee73af2…

MALICIOUS

PDF

69.8 KB Created: 2021-09-15 07:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 43ac8141f2631a9dbea5b703f95d13a1 SHA-1: 7d276f88e46ffad7083a03e1a8d05ca6e58394bb SHA-256: 750165a1cee73af237e92cd5d4441a1b0a6930f60dafdea77a0f239aad6b93fd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=wlan+finder+android PDF link annotation
    • https://tyeetomsfishing.com/userfiles/file/bizofedenu.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e93ccb073e---40605476369.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/limitivikax.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/26805858188.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614160346eaa8---xizaboguduwipomomabawex.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/71126245172.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/a3f8c1b8e14c05c31bff08972d23f9c6/wefokudiwugidebadula.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/eabd99c9156b66be18ab59cedd861807/zumepinigoxoloriw.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/fuzikal.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/lewosebem.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090603422298.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/rolanabudemitebenupek.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/37019852834.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/mhtg455rii6gq8unnh6tk1j9l2/61713391083.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8dl53aovr1qkda1cd75l7ejrb1/81887573505.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/32060582845.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/dc1dsfeeeql93p8lb7jmbs2b5q/60070110587.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109041210204159.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161346f3e6518f---97040744988.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/98373320169.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/livusaki.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/bakor.pdfIn PDF document text
    • http://elpijisystem.com/file/9976058500.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/gujalurijasoretu.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_off0000b540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB540 15256 bytes
SHA-256: eb17169535d83e8ec77d12e3d11e17e0e0c5b16d8b10704c8105cce784c08dea
font_01_sfnt_off0000db81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF398 10076 bytes
SHA-256: f72772755e3c84767afa4bf1fecfca6fd53713f6983a4c38cf11d4162f127db8

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