Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f336b7ec6c4f5f6…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 23:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9c6e39277151d452c68916f0ef5e9f79 SHA-1: 78afa1cd542b9f4eee3e8027c3efd114a40a7e99 SHA-256: 7f336b7ec6c4f5f6b7e45ce1dd6626bc56f31f3402bd558be148ee24f3fbac7e
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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 http://ottuk-e.org/userData/board/file/42857937758.pdf In PDF document text
    • http://7tec.ru/userfiles/files/86252913485.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/zowatazoxuze.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/daburixepaxu.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e048107b548---sitojofexowogawexosuti.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/67399739556.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/vudulemugazinidufasen.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/pijaxedawajanaxenoveja.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77a9ea1268---xerexajure.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/41370859874.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/veravij.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/76a6c1e667cc97f4e707a4f642a03043/virajofamasilomanowo.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e49732e3cf---pujagopukenewik.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607216ceafada---66400314168.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///vizizuzukufozubujepugeza.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/28437635131.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc49ea80fd---16569580450.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eda130acbe0---xararuvigokutej.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/82950167369.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/banumaxabirafazen.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/93892533159.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/10495719216.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/tezukakege.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/10356612905.pdfIn PDF document text
    • http://24cvety.ru/upload/files/2076466420.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/le7n6h21mq1m2ma4rpg5n48cb7/razolezazinawipibiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=orgullo+y+prejuicio+libro+pdf+descargar+gratisPDF link annotation
    • 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_off0000d80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80B 11200 bytes
SHA-256: fe66b9b3dbb4d3a029a2f62ac7f8e847a99dd17c2df6c5c5b21d94aff1dd7e34
font_01_sfnt_off0000f1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A11 18368 bytes
SHA-256: 9c2adf1ec66b015d60cb457f834f58450c086b6d0edb192552281096d1936166

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