Malicious PDF — malware analysis report

Static analysis result for SHA-256 f071209521830302…

MALICIOUS

PDF

83.6 KB Created: 2021-09-05 09:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 80db7573d0ccb4344285d68c183705a1 SHA-1: adf472a18e3d77419141c68d0842e45219b9e0f5 SHA-256: f071209521830302907b581ecacbc4e54906daa7e1edd0dbccde2c4efde5a303
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and link farm nature are indicative of a phishing lure, likely delivered via spearphishing attachment.

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://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/d44f8a8dec0c13db5e666707a4bc0aee/lujurezumogur.pdf In PDF document text
    • http://alexandraharris.com/clients/36054/File/2284197290.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/46025404235.pdfIn PDF document text
    • http://mcutech.net/files/93841075823.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608060bbe806c---98519305745.pdfIn PDF document text
    • http://amandamaitland.com/images/file/12819124051.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/43746644188.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/49pm7gbq9i6tecife7qmv1f0pt/9411797626.pdfIn PDF document text
    • http://alkanboya.com/files/file///60846256332.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/70612920066.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/womowukolekitewaxaru.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/derep.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52501cc85---75000940459.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/60572955327.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/pgt7ddoqsoj1omjb21msf58v25/lusisugadiroxazu.pdfIn PDF document text
    • https://giustofiori.it/file/9182223276.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/pedixof.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/tesiren.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/fererivezomu.pdfIn PDF document text
    • http://chouchoudauphongongtay.com/upload/ck/files/62402397502.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/71f5a50c35f7e3d5b576b0eecb6a2dc7/95052369289.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/70255977614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=association+aggregation+and+composition+in+java+pdfPDF 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_off0000debf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBF 18236 bytes
SHA-256: ac55ca2892d20b16b03e6160feb7d14c3618367dac5946111d16450294796c75
font_01_sfnt_off00010eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECA 11092 bytes
SHA-256: 2e54aea44cfe2802dfb446c52ebd4cccc4eceaf31fff6f64f61dc555690330d0
font_02_sfnt_off00012881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1