Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9f4a9d60d44dc7…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 01:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 82ffb76963b22e5b33da8088860887f9 SHA-1: 1778fbf68f71c965f994df3b8b15b4ad2ce94504 SHA-256: ab9f4a9d60d44dc706aaaa4eba8360c5d48b04c32f99b789093e40298d664c91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically related to phishing. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af79d7e6c2a---39876547578.pdf In PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/7549546364.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/legemel.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/98687389318.pdfIn PDF document text
    • http://annabarons.lv/files/files/rulumiwarivenibelojewoxod.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/fopugudoveva.pdfIn PDF document text
    • https://landi-bg.com/images/file/vofotunufunijo.pdfIn PDF document text
    • http://pi-consulting.ch/download/485326956.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/bukafisuremekadolemu.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd54228fdb5---zemovavelum.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/joruwewa.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/98724290541.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ea0c8427d0511f4ace78c77743f37275/56509268426.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/6259296190.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076628b4dec2---sigetitonufuvebaxanit.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/97474147621.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/2c854464d4aece87efff8942b6c908f7/jibeduferigojenidumemi.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a65503373a7474543952ef43099173d3/wimezututozezolidozoboke.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/c2ef968c825928a80d73764c3c22a00a/90047010841.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/5708128524.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/14394568936.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/edab245531619e64e3dfbc8cb0685e58/14169685433.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/viduragoliwikeb.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/83533475142.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/8474311a8597594414b88d99e1520411/giwukin.pdfIn PDF document text
    • http://fxmeat.com/upload/file/e05b488a78e2868b97f322c2f6882733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=market+research+proposal+examplePDF 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_off0000dfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 17628 bytes
SHA-256: de111bb2bfd0bf6037218b7568001d60df4bc78c618117f7b9cd4605fb56c811
font_02_sfnt_off000125dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DD 10632 bytes
SHA-256: a7681e2ae6a11edf09bdd733ae0b2e0461e551afc11ba747e13c4c0240250804