Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63b64fe26e0c8a8…

MALICIOUS

PDF

87.3 KB Created: 2021-07-04 14:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 86783d432dfea1e597055daa86b766d8 SHA-1: 2b20e7dd422598cfcf19684e118ab34091fe56ac SHA-256: a63b64fe26e0c8a841371c04cee4b17a65173a5719c874ed67e16f646e1b66e9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the document contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/b671a1222011abe17a645ced87025d4b/60602422673.pdf In PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/dhsa2f0daonbvelc43702t0sa4/wijamuzume.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/824f98306789fa263cf4069d001a6da5/97367405111.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077eb3447c78---resipawetulumobowag.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a7516e522fbe84c2598e936de8836b50/98097655522.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/wadapafogonetu.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/56628549772.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/50292796885.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/44cefb4117b50d21c1c6a4a88df43ce0/xibewi.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ebbd5abd3---sapepagozex.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/zotorazovujibilafozipes.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7e7a00123---nikagewapelimo.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cd29330e529---pomibotujijujire.pdfIn PDF document text
    • https://campermagazine.tv/public/file/vewefakejelej.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105152317.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/lukav.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/801f2db4b4e6d0b083eab6983642edfd/luxavutel.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/rukelumemajiruzi.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/12883518035.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607294a9b686b---panuw.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/jonafumofi.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/fabevovuxage.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f172c8e9b1---89120540830.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/49371791093.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/cpkurfqkd0hus4ir7u3967bko6/mibiripizesukefafor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=proofing+croissants+in+ovenPDF 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_off0000f269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF269 10532 bytes
SHA-256: f16b206f065bf5b4496d8b514089f06d83d0fc7d3fe0ccb0ae7c996e1b6aeef8
font_01_sfnt_off00010a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A99 17296 bytes
SHA-256: 06ff0d2f203ea0ee938fb5103dc436b61b70aab0a5f2d5154df65231f8325d33
font_02_sfnt_off00013797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13797 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1