Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89f247ee98da09d…

MALICIOUS

PDF

86.2 KB Created: 2021-06-28 11:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6167307ca58113570839ba789662ff4a SHA-1: 410962168dd6a20dfcfdce982cd3867240884052 SHA-256: b89f247ee98da09d5b1debb74c79931a780112e76c2000a96257e81e3df6bf84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised WordPress upload directories. These links are likely used to host phishing pages or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/scostmqk9gmpjm9q490sorec5s/wejakumozuwudawugoruwunos.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/7185f446834f2c09db0c1229832f801d/69771050629.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/8fc32357a105071b6ff54ab1c0cfe936/wasuzamunefalelexutejoxev.pdf
    • https://egokituz.eus/files/galeria/files/xevikeniborilix.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608434b54fda5---buget.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160786a05ca3e3---56110593017.pdf
    • http://youandisagenix.com/ckfinder/userfiles/files/88229060821.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ac16909a5---numeguxidisojixibewonu.pdf
    • http://kiuruvedenlukio.fi/tiedostot/file/mikizezuviguwuk.pdf
    • https://torbay.ru/images/uploads/file/78226506728.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/48a29ff0dd1cc93a681a926d13868106/62479121269.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab66c1e29---damikik.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/9bfdd8c00bd76f0ba5ce7ca118f98f41/17344997706.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e740853748---81642212325.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fd423b1e5---bejowijepi.pdf
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/5808736608.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee69ee3fa0---18818005454.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16086d18602fba---56214806660.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac107b6010e---76034229314.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/5db3ce060a16612f995e1423e7216130/tufidenulozipofujilexoxij.pdf
    • http://nomaquito-travel.com/editor-images/92701038496.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba72170ad3c---74128546336.pdf
    • https://assistenza-termica.it/file/rulizapixubexoru.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a31dac56c5---90419756024.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac44caf5bc---35128733105.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=difference+between+statutory+warranty+deed+and+special+warranty+deed
    • 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_off0000eef4.bin
f517a8c74f58e935700c90255bd58ae486b7cb702efaf9b7d16a04a296b50bb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF4 11056 bytes
font_01_sfnt_off000108af.bin
989d4ef7c414da1b9082e15dd8724053d4bd9609bb1dfac65f3d701df04ee796		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108AF 16284 bytes
font_02_sfnt_off000132bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132BF 16792 bytes

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