Malicious PDF — malware analysis report

Static analysis result for SHA-256 549fea8f612bdecc…

MALICIOUS

PDF

82.3 KB Created: 2021-08-01 15:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 804c7e535081f31324ffa7766179dc9e SHA-1: ec33d2f4194c6793759dd6623bc5b211814b8a29 SHA-256: 549fea8f612bdecc470252a5e6aa4e30a851c0bd9f8d791fccd05c44b8df08b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://schodylux.pl/userfiles/file/84335928656.pdf In PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3179e2815---witomomuwis.pdfIn PDF document text
    • https://hse.tw/upload/file/kopiwodukanujowax.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/7ecad99342006d3088a0f798d1935374/matibusano.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/95382950044.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/56eab816ffe7499a519e372dd15f6acd/zivogobokatenufuloj.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f72a24f14---38847807658.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/78480169640.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/jekabikabasixineka.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/16455953450.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/7692212734.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/d1464b4ddaf2aab3912856d9ef04cddb/39401087880.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/92616734937.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/58094302757.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/vefolatezuzenojanu.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/37200761274.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16092bd58f1d86---95451234951.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/47386721440.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073100472edf---50265624346.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a344b52cf29---sisodi.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f10787ac20---972702347.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160871482e2a8c---5752748364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=im%C3%A1genes+para+poner+nombres+de+free+firePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45C 1744 bytes
SHA-256: fe85e0a8a2678545e8e288ad89090fc3bf64d51d8303fb23b502e97109b2793a
font_01_sfnt_off0000bc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC98 16556 bytes
SHA-256: f9569a2c29adc5081a7dc3ab000649c2759621c4e9efc0c2a922fc1a1b28c1c0
font_02_sfnt_off0000d3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B3 20028 bytes
SHA-256: 348da7c49aa0fe3b290e164b45df80075ec92a0320aaab5130b2623d8aa71b64
font_03_sfnt_off0001081e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00012035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12035 10968 bytes
SHA-256: d4b53d183ee7f770197dbcb54759241d4432d83b51a8859f0c1b36d377bf1160

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