Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f21c5df7ee5692e…

MALICIOUS

PDF

83.8 KB Created: 2021-06-07 20:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 18437a2b590a307c14235b9b70a0d33d SHA-1: 5e995f1100490a1a0dd242047db6aefa4d6ca881 SHA-256: 3f21c5df7ee5692e37fef9b27269b811d2d6d97521c55eb34ce18a46a9cf1240
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a phishing lure, with numerous links pointing to potentially compromised websites. The heuristic firings indicate the PDF is a link farm designed to host malicious content, likely for distributing malware or conducting phishing attacks. No scripts were extracted from this sample, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2566

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/a258d1d45ab8cfb0e86c8288bdf3706c/wamafavofafo.pdf In PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f51ff778d49---xabiwizutopupoxawimorofo.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab54430ebf---89684851478.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/f023fe7f2aa6f996f343f57c94428525/fosadinom.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/moxogitegejomupitilazatog.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/nipedove.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076304798bcd---fimexebifuloz.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/6q9unhdqpjj8bh8981qkkuh9jn/zexigusezibeziporube.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fb80432ea---javinanafivedipipuma.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/pojomigijo.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/d9c976771b5c4572843a888f25a3f373/44205404004.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/92339176255.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160de02135d6f1---xavikuziluvosutuvut.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/94710367899.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d882a7a02e0---sexisukunux.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/l3j844hklvqb9c1ead9ns46h56/lajunamebegarupugumiki.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/60301321489.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4d251f053---66032919890.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6404b71f5---bozadu.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/88456537112.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608563b2480a3---redifigirusulofipi.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/0avct119t3d7afbclu0jt9eqj6/darufozizerenefiwezi.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/kureremofawezojinazuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cuanto+equivale+un+tercio+en+decimalesPDF 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_off0000de6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6F 18444 bytes
SHA-256: 095c50fbc836ccbe51a6d011d48dc156dab1c2ce0e627d30a2f0e5272e70961c
font_01_sfnt_off00010e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12628 10876 bytes
SHA-256: 7997ce14f4b4c38231676723d4d5f68fb9b6931e9f68fbdf1257e31b879c26f0

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