Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8127a85170888be…

MALICIOUS

PDF

90.0 KB Created: 2021-07-03 10:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1b775b8114d7bf13bc49ff12a4b55cd9 SHA-1: 9ca62abf1a9ac0601b1324899cffa9600fa49d48 SHA-256: f8127a85170888be4fc3d1f12a7f7eda0580385c0c307c1c4b59d5bc86aa3bf0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm or phishing campaign. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to obscure the true destination or leverage compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b213038aa81---19455008000.pdf In PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882921b8c5d---85372877579.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aad3a24fc30---16792434632.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725091da157---11493860689.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/gisiruwiwupupigapipekanuk.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/jt180nnl03a5fna1tsgfhagkd3/50344372639.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/28779174649.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/zenuwinumowajujupo.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/f1729c23db57b0e934bb2ab1bd2e5ed7/96771228090.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/tulegasefudaporafu.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/55844587461.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/01069d03bb30dc4eaf4aecdaa4f0799a/59468098632.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ef46d625b47af4cec4b9ac8e5835877f/sivufijudowumopeti.pdfIn PDF document text
    • http://pritchardreunion.com/clients/81409/File/naxarusokov.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607430d0e0d9f---wasasewoniromuranimonenir.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/14pvqlj0ulrmnnbjjqoff3h5ni/febata.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/kalekutikomesezedoleg.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/2189356297.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/084463ea74469210d49f94f8d95433bd/63442925622.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/27821794048.pdfIn PDF document text
    • https://giovannicaputoboutique.com/file/lulafidusegomufe.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/29311762761b1dcf46ba05105e72a933/30227620815.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/6bbdb8b77c8f134dcdce1c0512def6fd/13447572038.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050613233148.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d24408175---roxetemen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=solubility+product+of+ag2c2o4PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04E 11016 bytes
SHA-256: a3da4ad649ddf03d89fb2e1838dad7ada8c13acce251e3f12e42e2f041b7c0f3
font_01_sfnt_off0000f9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BD 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_02_sfnt_off00010eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEE 19232 bytes
SHA-256: 9d4299e072f794bab4550587502ae561bbcd1597f16842d69960149ed625dc52
font_03_sfnt_off00014236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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