Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a50c9c2a0d3626…

MALICIOUS

PDF

84.9 KB Created: 2021-07-25 21:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 62b8b7dcc921e50b61bfe58e23fd1f2c SHA-1: eba7f457c9d18241e3fde33a4d16a773b476f586 SHA-256: 12a50c9c2a0d362640abb07c6e01a07f2670b55e73611a1b525c9104b01e0efe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories. These links likely serve as a link farm to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/2d600ab97ef6f37d38c0de6894a55d69/mugojajonavivomo.pdf In PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16070720fe96aa---50114307932.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/74791258220.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160985aecf4029---66817252958.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210607/210607043014623168d84tr5s7sxjm.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8aa1b67ed5---30461608507.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c2539a960---toditonisobobamaponoduje.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7c468e693---11468731973.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/69214199867.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/mivepapubevaxadojolez.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/11142542490.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/56296158269.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/mitirove.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/at4uos67ure7n8u2i17mjgdqa1/87096586309.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872d6b09f8f---74710537789.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/35138201874.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5190cd484---supugebilibe.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/f7r2kh5lg89i6mr7sk5p41i2j4/jafot.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/lizawaxotetopuvewabitakow.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/56954421003.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/fanepineterejusigaxufog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what+size+yeezy+700+v2+should+i+getPDF 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_off0000e847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE847 16888 bytes
SHA-256: 293db136886ff8ed5312981150793d799cc4ff0b6aee617a7cab9c63943622e4
font_01_sfnt_off00011444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11444 10948 bytes
SHA-256: 783ed0b016c86cb715994e5f7109dfe1db72b377b4ee06fc21f0d04fa26e6114
font_02_sfnt_off00012dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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