Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9ea51a28c462c7…

MALICIOUS

PDF

86.4 KB Created: 2021-06-26 09:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9e10baa88698dc85b2afb391809a32cd SHA-1: 3ff7423cd72694833cccbc938842b3ad22ac2b7b SHA-256: ab9ea51a28c462c7b8bef4d55abcec889e0f8e0e55547e4f33c42513d17f1364
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b48748a52b7---jojufudiwegevowefaxoka.pdf In PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/uf6bh82dd6us7vvk25git3h302/4254532697.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/cb44f61765f3e88005947963f86bb750/39169337818.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/rokifopepativugip.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/15877955468.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607470d1a11e4---lixovupipetetawid.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/4lnaqp4oit8ea7q8uneit4ng5m/66544420579.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfdc952cb3---mapilowakudikoxizewimaji.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/rutajebitulozetimunukivu.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/p3gah2o7jdlkub37t3oifupoa6/72433150806.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050301220743.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///95952461641.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b46cbd6b649---74961284599.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609df209c0a12---482609497.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/24433513506.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/88859788890.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/85326851455.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/45034066271.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/sorodizadefewuteg.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/rimogara.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/76550872351.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/300e688de68ac10a718f9c49572844c8/87434159494.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747dfb84a68---14614719682.pdfIn PDF document text
    • https://mmszke.hu/files/file/29459436214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=anime+drawing+websites+freePDF 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_off0000ee63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE63 10740 bytes
SHA-256: b934ce6ce95911e08fa8906a5c222da800d936efb7734f705dd1d8a0540e440a
font_01_sfnt_off000106ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F01 17360 bytes
SHA-256: 8a44cd0005227737fe465e0ef989c4955a8dbecdecd30556c7dfb811b6ec2c02