Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea195a439c6958f…

MALICIOUS

PDF

117.0 KB Created: 2021-06-25 12:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1519017a8fa02fbbfe9b94cd92f16a7f SHA-1: aa1adffe0808efc42e826b92fe81f02b2667c034 SHA-256: 3ea195a439c6958fca54c79f29e7e5780d4de20ea58779e0ae04f63b23f879c3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/8891aa002cc88a8d604fc0d1c5e62ddd/wapipolusabenamerogijegar.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608170a8e54ee---34646987254.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/3887eac74bdd1ef6e1e4a7e6c46085af/73340336042.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/4a0d76cad74744d60f6b477b42b143b0/42606559533.pdf
    • http://meble-tk.pl/userfiles/file/nakadewow.pdf
    • http://vimar.ua/userfiles/files/xagovojepupixe.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/tsgv790lo5en6a6cahe4tq82sf/90817457019.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/9bbadaa97fbcbcfa4daeb5ef33cca1a2/suruw.pdf
    • http://circuitoinsulargc.com/documentos/file/16717778219.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752cb24c655---88714564789.pdf
    • http://maslag.eu/userfiles/file/newefaruk.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/rvvefqvc7r2t2ch5i91tnkkvmh/1939170847.pdf
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/1853281239.pdf
    • http://alemotta.com/resources/original/file/vefeno.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609017dfc6ca9---85194537049.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=naruto+ppsspp+storm+4
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117ba.bin
443124121815dcf4866baae1b1028cd54392af96f9940909d119fcfd29366dd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x117BA 10196 bytes
font_01_sfnt_off00012eae.bin
071fe370a7780ed6e91d488a87e5e7e9e41fa6bbcb5fa2e488da84f6846857cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAE 18060 bytes
font_02_sfnt_off00015d24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D24 16792 bytes
font_03_sfnt_off00017535.bin
be851b298df7c3c9d2daf20623ae38acb6a52fc53d8fe81893fa0ee80d61d9f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x17535 16280 bytes
font_04_sfnt_off00018b40.bin
58de4c82a6f9c05addd8c0f94b2da8bfd1ae045961f865c6dd1d0c2ed7908229
pdf-font-stream PDF embedded font (sfnt) at offset 0x18B40 19344 bytes