Malicious PDF — malware analysis report

Static analysis result for SHA-256 f830938e81ebd0cf…

MALICIOUS

PDF

83.4 KB Created: 2021-09-05 02:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cccce2bd9a076f330ce7fb4a7e84d505 SHA-1: f8c22cbbe3ac2240d13af0a53fa2925d44eb1f53 SHA-256: f830938e81ebd0cfdbdfa0103f50fe343138d55779cb416c1cd78a8436dcb4b4
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. The primary goal appears to be directing users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://virtrade.gr/userfiles_lybo/file/85881276170.pdf In PDF document text
    • http://fernandopelosini.it/userfiles/files/5615926132.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e11561854d---xobeled.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/d4u9s9rncfr00udjvaohknbvpk/binimenapofo.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/jimaz.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087474506c29---mowomigaxomogu.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/je9aum8ht4l31v88q8qnlscb55/fopaxejamepiwefexefuviso.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/70425228723.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/af3e7dc25c9b3937e3a215628330972e/34327575815.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d950e3c337---mowelavuxesipedurizur.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/82046651384.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/juzopugilapukuginuru.pdfIn PDF document text
    • http://familiesforfamilies.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/tagobefu.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/14874551526.pdfIn PDF document text
    • https://goodline.by/userfiles/file/tudukaxusafegewex.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/jariwipujonigapuzum.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/f23985e82d79d4826787737489f7a15e/86371276644.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/liwofokosejamefupejowoxa.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/16911206856.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/0mjldfa79hta440anmeri0e310/55287585342.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/29377478663.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609231753e6b4---tagajewerafebavetupir.pdfIn PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/botufo.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/fejusunup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=livro+sobre+pericia+criminal+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_off0000db5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5D 10848 bytes
SHA-256: 111bd87f7a48f4ced37859255fbd7bf3a175456594d6fafa0bb048eb78275cdc
font_01_sfnt_off0000f429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF429 20788 bytes
SHA-256: bba1a11b93f9cdd45b0a04ba8c941bb359c1739ecaf8161d7e474879659cb0cb
font_02_sfnt_off0001277d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1