Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8666193c6a985f…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 07:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d564950c6a6280ea74e1440870d1909b SHA-1: 2e9e8f285bcd87e3f1da5770ff3e2828127b3de7 SHA-256: 3a8666193c6a985f330e4e98e035117cd2df2b4fb58ddd1bc603c2a39654d2e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many of which are hosted on potentially compromised or disposable domains, indicating a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics suggest an attempt to deliver a malicious payload or conduct phishing, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/93263815526.pdf In PDF document text
    • http://ajivikafinance.com/userfiles/file/bojezojep.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5480c91015---bibepidagubezuku.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/45937565055.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c25ce3dcd1---18819676028.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ec28b3685---71838135127.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/454778393b0dcb1decec0b81c75506da/98246710641.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/mevixuxosipewotopejapos.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/rolefugumukirilakunoxej.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/18307498879.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/xewefa.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210720_5EAA0174DA7805CF.pdfIn PDF document text
    • http://uco-kampen.com/media/files/lorexiwotuguv.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/sumelojalojidut.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e3764063998---1868922053.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/edf9fe77b6d34a31ee4327f1cf725e68/puwurid.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b125ee4e289---39124898263.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/95531737442.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/69646268433.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/sudavivobokawomekavoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pbs+newshour+extra+structure+of+congress+worksheet+answersPDF 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_off0000df0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF726 10996 bytes
SHA-256: 48e49906e30ac9aaf6fd94ffc1cef2acf5d5fa177e460ab25b7d324c894eaf70
font_02_sfnt_off000110d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D0 18068 bytes
SHA-256: 27f03a148b608967b03d8e02a2249cb2bddf14ff9766e295bd50645f509be83c

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