Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd7b21d4adb5564…

MALICIOUS

PDF

87.4 KB Created: 2021-07-16 08:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 42c4f15ac7a7c6f99f0f6012c10d4371 SHA-1: fc502654b6cae1a4edac26634eb316a8fcd5abf4 SHA-256: 8cd7b21d4adb5564b160af2abdaed0d43947c6f60ca29524ea792d00e2ed57e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16095adf688707---73941975894.pdf In PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/oii50koag42erdrgnv4b1ignc7/fojalod.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa50255a55---67168396617.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/8319970295.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/85256984047.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/91017736543.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807cbba2ebf---61313683126.pdfIn PDF document text
    • http://poorclarescork.ie/images/pipenerigetebu.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/49f5n0690o5bs8j0eqcnor1ttj/japukevomunukitub.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/wepipi.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077329ba6b5c---10409374753.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/forimirabasumalogev.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/ftqf6bl26jvt5t5kh90o9lohi6/59496882050.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/sazanixuvi.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adb96dd54d---85185144127.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-06-19/images/files/juseluselulalanev.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/soxemeduv.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b05d97273---26935424243.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/wederekuzevuxukigijime.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3c108aef4---84650228884.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-22/20210522163104765764.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/9234af9eff4d7c1f5863ea32ca2d6a31/16739215389.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffbea3b0b0---31498535118.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/badapakobikagatusanosaze.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607212f7bdf04---dinusu.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160796a4394e8f---futapiratapexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=epistles+books+of+the+biblePDF 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_off0000f4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D3 10304 bytes
SHA-256: 9820d316f1a3f415433857e90c841d202c0c9e654a996ebaeda53cac6800542c
font_01_sfnt_off00010bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001240a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240A 17228 bytes
SHA-256: 70b0246dfc6bf3bcfb59e2aed1dca45f0d517adec708e70085d8f514a10c06f1