Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12a63b96dee1a13…

MALICIOUS

PDF

76.6 KB Created: 2021-08-28 09:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 50e11cc2053d5c59291fb6f235e2f7f6 SHA-1: d2f01dcb09493fab20ebb57738a0216dbbade3dc SHA-256: b12a63b96dee1a1360a52c578800b72c4b8a139edb3912aec48d372a63b420b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://laborke.ru/uplcv?utm_term=monthly+grocery+budget+for+4 PDF link annotation
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe1fdf352e---jezosojedapekogarale.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/36836152794.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/87100324864.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a780496b0ae---68236527615.pdfIn PDF document text
    • http://biomisszio.hu/tmp/xafuwojuzufavawojus.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/68454ea3156329a3a9de10da841eb9f1/pazetumizogujadumeval.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9d56697110098afd4377e1368eee3f6b/rezudabodixofuxopaxiwo.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/dedapipoxabozumiwavibone.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/2ngcvf81b3a73nvijkihqd8h45/guruwotowebewilo.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e91f74a7c5d---7520053268.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f91a4b4aa---xatujadajasoxuwugexukop.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210509094135_767621936.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/jenurobajokom.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb72e337988---57219954513.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/iabctsocnlu5nm8qs4c4gkpg36/32922832495.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a27ca9a844a---zeretowupazu.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/zebovexek.pdfIn PDF document text
    • https://dm288.rs/slicice/file/selesefuj.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/23990538337.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/10383140194.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0138248001627206548.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/tixaropebogomolamezegis.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/53069723618.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a27f030bb09---fegozilekusatixi.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/kewadejakixutoju.pdfIn PDF document text
    • 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_off0000c608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC608 17260 bytes
SHA-256: b92f48da6c0dfb0eca9be3250a98158b4b9e264a45891bba8d71fb20539352ef
font_01_sfnt_off0000f2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 10760 bytes
SHA-256: 4a87b5e0a80def4ac0032c36ef74b3497d30f50bd78928bd514a08df6d24878c
font_02_sfnt_off00010b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1