Malicious PDF — malware analysis report

Static analysis result for SHA-256 535151ddadbc31f4…

MALICIOUS

PDF

92.3 KB Created: 2021-07-14 04:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3448b1fa149572e1ca33e2403085e79b SHA-1: f9d846ba0a729ebb63c39eaeab0d9ab07b0f47d0 SHA-256: 535151ddadbc31f4ef381c4fb233cc7d62f085f607118819018b973f01cae933
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics. The file contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content. Although no scripts were explicitly extracted, the malformed stream length heuristic and the presence of numerous external URIs suggest active content designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608413a109c05---lufelimaribotu.pdf In PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/sobuwagatigivezeba.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/0269116d2f9288bcd025d5fdd87def8f/zavilomobo.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/kigutedesi.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47ff573d5d---17599105442.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/mokuzimumorojulu.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/33004764944.pdfIn PDF document text
    • http://citra.cl/userfiles/file/93283482828.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/27752790664.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b63367bead---kivesonixojodegovoguzovo.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/79486452108.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b09642bae---86940882018.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/0aedd50300291e031725a7ff088a9863/faporibezu.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791be3688ff---tosizebati.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/diretasum.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/dff969bc641464a735f06b2588f8b53d/supamiw.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e9bf9f9c2---91772047941.pdfIn PDF document text
    • https://senhewood.com/d/files/tawosapuxom.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8ae276dc4---38839071540.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/l9o0skvjh61vhmsenqoia78bt0/73383216324.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/30294441016.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/8557890376.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ad68483ca---xivumusera.pdfIn PDF document text
    • https://777mto.com/contents//files/jawediwuvaxutudobedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=football+drills+with+social+distancingPDF 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_off000104bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BF 10720 bytes
SHA-256: fa9a5db8ad11f3da989885b013385a8ba5990d4b01f6bca15f482f4789fa63bd
font_01_sfnt_off00011d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D23 17208 bytes
SHA-256: 9337f121d2220e2cfa4ed606b7fa804f0ffbab61e04b8b44d637f2da8db592de
font_02_sfnt_off000149ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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