Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68d4813165214e3…

MALICIOUS

PDF

88.7 KB Created: 2021-07-05 10:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67191538733a4178edcab56cffaa0f34 SHA-1: 02372d0ed7c4d7e8eef57cc8ee62bcb3abf87810 SHA-256: a68d4813165214e387b819d6ac0650a12b30a19a2412aa5b82e50bfc8d7cd77a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to host or distribute malicious content. The presence of multiple links on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b86f9ba8573---pelaxizuzajifig.pdf
    • http://riskhedgetech.com/uploaded/file/184517500460c065a52c360.pdf
    • http://aliceinformaticasrl.com/user/pages/gamaniwival.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ecb33e7c7---dadoxonagizu.pdf
    • https://vieclamday.com/userfiles/file/18494618762.pdf
    • http://sevenseahotel.com/uploads/images/files/pimosidetorogorutusaxexe.pdf
    • https://lienlacanien.com/img_pages/file/99572619440.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccea248d1d---82954806664.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/f82f934f67df65cc71bc02172ea4dd22/66843922515.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e27e9291a---10303827435.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53dcb45148---87353084122.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/362eb87c052057aee183d0350515720e/8906951243.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nek0tgno60oft7g9jqf5hiuka4/93762062933.pdf
    • http://laweasy.kr/userfiles/file/16077766902.pdf
    • http://altinay-law.com/images/file/rakosuvoxine.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9a99ea1a2---56006565338.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5a8b50af7---buxojonupelumikelukexipoz.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7eceb5e62---boxajojus.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/de4dc89182a822b053d7950bfd8537e8/54381829030.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73723921f0---pibebosaxorilitumivukop.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdd20ed088---26719277090.pdf
    • https://yz-yongzhong.com/upfiles/editor/files/25434295911.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160995d0862cbd---bugeve.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f384d734f1---renusibojoxibovixalalu.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8018b587b7c5264ff59db1dcc753b061/tuxaxoledozisigegiloxejis.pdf
    • http://vako.vn/app/webroot/uploads/files/budolulekalo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=baby+swallowed+fluid+during+birth
    • 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_off0000f1e3.bin
536f16cd293bbd766dfed29872c77e37fd1370020eda916f560982e67fb8bc55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E3 11128 bytes
font_01_sfnt_off00010baf.bin
a74223f167f3600d368f8863ccad4422fb350d57d4f9c1e06f69288f651da0fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAF 18924 bytes
font_02_sfnt_off00013ba8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA8 16792 bytes

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