Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6578ef3bd80245…

MALICIOUS

PDF

84.3 KB Created: 2021-06-30 18:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7bcd01dea4edad970e66b237db6cfb0e SHA-1: fc1d53801a5478f4049779f2771e51cdad02b47f SHA-256: 7f6578ef3bd80245de7b00339f6d4b64068f432f2be2bcffa0e1712788c6541c
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 identified it as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. This suggests the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/1c3df337bb1c43f5138fca00ccad6dab/74312399807.pdf In PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16085b21361c79---28291682240.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160721075d677a---86244668513.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/18881841397.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/nenelokavetogisofib.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a976c3a0cdc---20488509917.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/18888129015.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/kewan.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/27231822116.pdfIn PDF document text
    • https://piuspvc.it/userfiles/file/91372532572.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210624_2CF5FD75275FFDAC.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/xuvig.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a22ff2c68a7---62496985791.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/d2ed118ce45ca36ec6e49194b276c60c/volesiz.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/guzija.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/17573810116.pdfIn PDF document text
    • http://ombs.ru/uploads/files/jalowanox.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717322e14d6---42640029721.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/runaguxoromesex.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607afa3f1df32---70583879868.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b115e26292---57556540098.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/qfum7330mc9mliqvb6ldmvip30/kakuzugigulomela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=types+of+fat+tummyPDF 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_off0000e6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B7 17168 bytes
SHA-256: 3f87316cdc5d5a1c44b3d8bdbabbc949a488aa9860d3824cb6281b24930eca0e
font_01_sfnt_off0001131f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131F 10352 bytes
SHA-256: eea447e7b2e1d353177bdbbfdae804b81870c2b5c4cb52b734fe47aeb2b84272
font_02_sfnt_off00012aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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