Malicious PDF — malware analysis report

Static analysis result for SHA-256 927f1101e826e88e…

MALICIOUS

PDF

98.8 KB Created: 2021-07-23 22:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 067663d22f6b25897b00b884ce2874b4 SHA-1: 10424fbdaf5f3f9cecb05dc87f44bbd78e4a0a32 SHA-256: 927f1101e826e88e9dd44836373fcb096e18f40eb9394e4f80e56e04e9fbbdea
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It functions as a link farm, directing users to numerous URLs hosted on potentially compromised websites, which is a common tactic for phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://dui-antidote.net/images/userfiles/file/77355789578.pdf In PDF document text
    • http://ever-pioneer.com/upload/files/rupuxopu.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/gs6sk8fbsf66rp13ha22qttmc5/3876864450.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d109b9c1---38666042124.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/purexak.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160af049baac35---2311008394.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d9e5ab1c1---biworapafekazeloza.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/79425581440.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210623001456.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad398621d---rejibopaduwupiviluj.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/lifedasowugisilaxekiz.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/70a8ebe84682394dd48df0e0b395c3db/peropalotedofavuzakutani.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/86984660837.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ca0e2854db4f524987d946d51a874b0c/55954972860.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/lovolakodadezekimokividuf.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/44028289575.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160763f0f17ed3---86226198641.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/farewavewuvuxisikerosul.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/rawafad.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-7-10/20210710082908610542.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/uusafea518mh9fn7uverh2sct3/33772211216.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/lanegapadufol.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/17051343957.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/95044120577.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082676baf2d4---foxajorup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=necromunda+book+of+ruin+pdf+megaPDF 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_off00011ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000136f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F7 10960 bytes
SHA-256: dba032de53734cdc274e84405d2addec13ee07cddc7e6c6c34eea1d964b9cfb7
font_02_sfnt_off00014fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE9 17196 bytes
SHA-256: 2aec787e892dbdd17759f4105ef61d054765324b157da12a582ab92094ae555e

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