Malicious PDF — malware analysis report

Static analysis result for SHA-256 69cc3951dcd9519a…

MALICIOUS

PDF

86.1 KB Created: 2021-08-14 01:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8ef01049cca5a696d6eed6670fd3729d SHA-1: c96ba186189449ced704a7b1f36e585a39a0e453 SHA-256: 69cc3951dcd9519aefebe427db967940b5f3f1eb1a1e123b749bfc0528ae541d
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This pattern suggests a link farm designed to obscure the ultimate destination, likely a phishing page or malware download. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://philabc.ru/uplcv?utm_term=ejercicios+de+multiplicaciones+para+sexto+grado PDF link annotation
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31e8c69d6d---nimolegawuwezetofajela.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/abb44eb99f4706875cc3bf98eef4b8bc/zedukowuxusapakaf.pdfIn PDF document text
    • https://egf.tw/test2/images/file/zulolekozaxebabapofelir.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12fd2629fd---55505041289.pdfIn PDF document text
    • https://iohrp.org/f_files/files/xizevedowerepan.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/71252243451.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/vejesenaburamizuna.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/90984734603.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/22002239002.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e6a5105e0---laronabisapurekozonawu.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/98649646076.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/4e832d5f4774f952a0757646bbcccad0/64216469648.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb811fac085---befotov.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/5e9b0438dec2b358d47654ee0851f0cf/65716645208.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/farukisimixurikuziga.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/thbhve5rq106n1k9t2tkpnu3s3/xusofusujugupebuzutapekan.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9aacfbfcb0fa23972c41579e12aa893b/88283050299.pdfIn PDF document text
    • https://menu2uplus.com/images/file/99395801114.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/99137427403.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_off0000e842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE842 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10059 11172 bytes
SHA-256: a99a3f640105354843df864c2efe8cef8d7bacb8385b081f78336887edff0275
font_02_sfnt_off00011a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A34 18140 bytes
SHA-256: 7d6706d69f4c2c99c894cf0b74661e097bf058886b2cf43ba500c52dab8462b3