Malicious PDF — malware analysis report

Static analysis result for SHA-256 541e713e3a4f01ee…

MALICIOUS

PDF

86.9 KB Created: 2021-06-25 22:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc79e177075fdf703b69015e49893112 SHA-1: 305ed125ed7bd51842d9d060fc78a489aabbf88a SHA-256: 541e713e3a4f01ee8413f8a0b5b9c3309947698139e1729c9c6e13ec146e7b26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, primarily through its extensive use of external links hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://chcial.ru/uplcv?utm_term=main+currents+of+marxism
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb4c909a8d---zelokonolekifufiderid.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/c6307da24f81e8a9662d840502eee262/87488246598.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cc9142f70---bapijepisawudi.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/hm0vpvjpi03cdn6941oicfc7rm/25981973752.pdf
    • http://desagresbrts.com/clients/34568/File/milepebozolin.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/sf4jcqsa0t09n2970bufqhv4k3/4584168968.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/38d78b0950879a1950a84eb95def092e/47392872809.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16079573e9120b---luravovo.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/e67273cba235f86792587bbcfe3b6242/39005780329.pdf
    • http://helderlive.nl/ckfinder/userfiles/files/firap.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079f8352268f---tajowitigoluterigojivefe.pdf
    • http://yngc.ru/admin/ckfinder/userfiles/files/63081376738.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/momu5ofk14vsepokojbetd3hgo/gukobomulisivekegizibor.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcee6c075f---solujirobijilafikamu.pdf
    • https://giolog.biz/images/bulk_images/files/89751194710.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88ad093a89---9613326440.pdf
    • http://edwardnugent.com/userfiles/files/43165496509.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160cd00015a85d---38550810340.pdf
    • http://china-hold.com/UploadFile/file/20210525030010457.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/at4jp7jqsq92etbp1b4dh6rcl6/36399118606.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16078c6dfa871e---wubuno.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc290553be---56191508770.pdf
    • http://konemara.hu/userfiles/file/geziwidegigexofijanarik.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160909145a8b42---zamevamajisaken.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef80.bin
826f21d64e44ae6522c6b4a47cf7ce61beeb3b65c9155666fd6dd311e2277299		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF80 18004 bytes
font_01_sfnt_off00011db3.bin
361dfa5c54a51152ff56773a1f453a4569f17183bc82188cc29f55937f4cc71b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB3 10648 bytes
font_02_sfnt_off00013628.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13628 16792 bytes

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