Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6cb34dc9490279c…

MALICIOUS

PDF

88.9 KB Created: 2021-07-06 13:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b26d2a1800cb63c65e27d06c297e1d0d SHA-1: 8454729c53e3c16030ba36961ba32c9005c84760 SHA-256: d6cb34dc9490279c30eb495925be0824ce2e00f51e8cb2c765a1d0e06282ba76
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://hirurgija.me//files/wedevezug.pdf In PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4f0774b69---kevigejodusagaragesotamis.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/48376399569.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/12059721776.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/83857710319.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/81g95l6eqvavl28h4hd3abi691/22393840237.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a955538b57c---lupajetejepusuz.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/benopuregivezixumew.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/0d1e8fd16867f8437b74e097c6d6cb94/57185316024.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ecabb3658---rulaxekomefamepenonexari.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/a116dad8d1f6b2d5f9f9036643c036c1/41700289529.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/roruxoketori.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d50886bf06e---25106408732.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/68070523595.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/0d312e7025733beed112d5c3895c58f1/27049986745.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/luduxeteziwimu.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16071571d5efd3---radubomisimek.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef8c90bab7---bafuf.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/digukaxapajewoxujakuxu.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/jewobunakebubiniwezapu.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ecc6ebb98---84023853126.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/g32pfstlefudlvkq2dji81c6e7/12740972160.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/2dbed7381247dab169e71c3dce29ba16/59061171085.pdfIn PDF document text
    • http://thedreams.cz/files/73878808696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=what+have+you+learned+from+this+activityPDF 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_off0000f46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46D 11016 bytes
SHA-256: 3c414fcb3c2d7ef327f34d323f88a0c1097274a67cd20ab19e642928ae0286ec
font_01_sfnt_off00010de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F7 17812 bytes
SHA-256: 372e4882073c135a268ad0fa3550fd79a3040b56aa1f7dbe3e33bbc413eafe07