Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c3512f4649c44e…

MALICIOUS

PDF

79.4 KB Created: 2021-09-04 01:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7b7d703d5c0493ea0132c7212ea7efba SHA-1: 842d1b0744f40a4821ff89e0a0b5b0313a4f4f29 SHA-256: f1c3512f4649c44e67aa2834c3790f6b108b051fb9fca3f9c1e035b38d1845c2
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. ClamAV and ML classifiers have identified this file as malicious, specifically flagging it as a phishing trojan. The primary function appears to be redirecting users to potentially malicious content through a network of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gangwontaxi.com/FileData/ckfinder/files/20210716_B85C6ED2E4796447.pdf In PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/d2f4313a62017a3e6bd7275869a6e38a/27336104898.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/gg63i43molju4loq2lrv1ltmf1/rupitegufivoxibanorunep.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/ae5deee554686bf2efda5130583db8a7/gipirodupe.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/18723197182.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/48815366521.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d18222e04d0---tinoxo.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/guxaropimuf.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab84ad79617---66587227982.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4d0b2b49f---mibedovedatexoruv.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161275d2a1c076---42865886000.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/7571304048.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/xekikedasopak.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/90370304924.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/96871032746.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/filibiwogaxaruwezis.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85ce87487---begupipe.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123c9201fe2f---69574434353.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16121b868a956e---33495610028.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/napixevedagezorexosiz.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/rejezesabix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cambridge+touchstone+4+student%27s+book+pdfPDF 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_off0000c785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF97 20536 bytes
SHA-256: 1b3a5d605662516ad2f0425d4eff4c3f69757eb35cd1654a7699c5271d931e74
font_02_sfnt_off00011507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11507 11496 bytes
SHA-256: cebaf33f41206b5f4b4dcd4d7a22139865fdec4ba4b94d6304074ecac1d443ba

Open this report in the interactive analyzer, or submit your own file for analysis.