Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6c4ed95006ce5c…

MALICIOUS

PDF

81.0 KB Created: 2021-09-09 23:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7c63b4584085d66b73454ae64c2cd08f SHA-1: 7fdc812600b8a91b528d6623ec09afcb20548d78 SHA-256: 4a6c4ed95006ce5cc536fe4dab9cad5eb70102f2855814d8891a4b531b3369c4
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute further malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly supports this attack pattern. No scripts were extracted, but the overall structure points to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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.
  • 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://chunmianxian.com/upfolder/e/files/20210905202151.pdf In PDF document text
    • https://cordovajewelry.com/images/file/gakidodorabobalurewigato.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/864c78d8dbd590b5f4f98fd8d5a6c778/25535343532.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/30290219806.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/61558635146.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/23928227117.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/surowuralurapa.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/xudowufid.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/budenedovogajozudu.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133b6ed6a89c---82599374216.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/814724695.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/xigemarotom.pdfIn PDF document text
    • https://ms1oke.com/contents/files/89381577236.pdfIn PDF document text
    • https://fasaac.org/temp/files/kalarejow.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/579fa7018ecb18f0829755ae5386af3f.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/fimisabukuboluruven.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090811092373499.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/47521475802.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/4241025634.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/74746500386.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16132b200c590a---mibekajudulerowujo.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/63845362002.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/werigevufakagamebuzef.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/xufesasirosovuxew.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/konozijipofexojakubosaki.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/21106102956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=recover+photos+from+factory+reset+androidPDF 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_off0000d4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB7 11064 bytes
SHA-256: 8dc048714f8f26ca7832a56cfbbf9c3eeb5cc83bc9450687e170d2c8cfd70656
font_02_sfnt_off0001065e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065E 18512 bytes
SHA-256: 7bb71f4d4d79f7854538cc3e9b4fecba84d7b6850b00dfa2fdf60f18292ea302

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