Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac522abb14fd226…

MALICIOUS

PDF

79.5 KB Created: 2021-09-07 05:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0d9b7100263d91b72f31fc387e5edabf SHA-1: 5599feb23908ec9c63c393d2f3ca5ebee66606bd SHA-256: 0ac522abb14fd226c7de7048fec559ff131e58cb476ba3424ac76116eebb3778
156 Risk Score

Malware Insights

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

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF is a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The embedded URLs, such as 'https://oniceh.ru/uplcv?utm_term=france+tourist+visa+form+pdf', likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=france+tourist+visa+form+pdf PDF link annotation
    • http://monroehighwildcats.com/clients/40160/File/40668033624.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/d921c614c283e265ed89d0f4cc8b6830/juparexuxasepi.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/munuwutojagubibaresupuli.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/27942119357.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/segovisifane.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/73758732012.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/vph1080onikcjktg4984p1ccvb/zedokerogezuwalevuvexitiv.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/76817615053.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/lofelosivusa.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfacdf0770---39116927813.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/66225011815.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/sifudunerijufa.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/8n7knu1vf95sracbhjeo15pjr9/basajizemaxobu.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/13369510970.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102f6ad9ff5b---13104808408.pdfIn PDF document text
    • http://sns.hu/_user/file/pasonoxamomagaropik.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/96437327660.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161173bddd6f68---farumuzasuka.pdfIn PDF document text
    • http://monroehighbeachreunion.com/clients/8/88/88bd109b8fc96949fe6caf7698e88fda/File/fofijunosa.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/370f97d1d8b194ef8554b1aec4854a1f/lekigogatizorow.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/gapifubininovexovonorem.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/jofoxusefoladoje.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/1q9djcfqbt0u6t40nfu8ljod37/rikinopopaf.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/5837732971.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_off0000d29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29D 17268 bytes
SHA-256: ce2e1d3dac773e9caa728477a8cf5fb8b432c0189644189a5edfc1d5b9f2f7d0
font_01_sfnt_off0000fecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E2 10880 bytes
SHA-256: c8669d493fa57f19b4f5cf44df2dafcb0c58501386e9eaccb421960d7c772629