Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e6b70dd367a574a…

MALICIOUS

PDF

77.4 KB Created: 2021-09-15 19:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ff8a0d15208de3e3a68bb0616e4a846c SHA-1: 2b343b5bdc5aad358e79a1452d24a7d118864f80 SHA-256: 6e6b70dd367a574a12f3fdf9847ff1213138c0dcbbd4c26cfdf8ec475986cf25
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by an ML classifier and contains numerous links pointing to compromised WordPress sites and disposable hosting. The links are designed to lure users into downloading further malicious content, likely another PDF or executable. The presence of 'utm_term' parameters suggests an attempt to track user engagement with the phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=sweet+selfie+camera+apk PDF link annotation
    • https://karaari.leaddeehub.com/userfiles/files/sirukigowokexibaja.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219264921008.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/64743957957.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9b70d5b1a---7392078355.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf5bea71ca---81750451969.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/sakewegadovivikujakufigoz.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614119c733a7e---82906338109.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/fogegulufadipi.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/fuxexodujetimikekozan.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9721110a---lavoti.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/wukitok.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/tabijojirefomibawap.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/batazosamogam.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/rakeru.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/7650548978.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/notoxozetog.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/59908699764.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210911095752.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/45748370096.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/voxokinalulo.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_off0000c669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC669 18976 bytes
SHA-256: f700b6ead08a6e39a3b7e6067c9a6096201e2eda33418eaea7b7c15bbd00acb4
font_01_sfnt_off0000f7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DD 10672 bytes
SHA-256: c4c9a9d2d4a62e7e4a36c46a87f4aa2fe7d4693ce59cce56ec7c592fcdabb406
font_02_sfnt_off0001105d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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