Malicious PDF — malware analysis report

Static analysis result for SHA-256 0de7f89c104e9898…

MALICIOUS

PDF

83.1 KB Created: 2021-09-03 11:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: abb0345a060c71be63620a2467a7fd54 SHA-1: 3a834558ce17d70ce5f851af77b2ae6238e2ad62 SHA-256: 0de7f89c104e9898b884da203ac5abbd47610e7a6fafed176cbe0d5b07c78677
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress upload directories and disposable hosting, likely serving as a lure for users to download malicious files disguised as software drivers. No scripts were extracted, but the presence of numerous external links suggests a phishing or downloader attack pattern.

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://kcharp.com/ckfinder/userfiles/files/23810458648.pdf In PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/4678e5eff5cbb72f1ab6ab182b3be1b5/kozuxosavezoti.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b78f8bc21a9---84138010732.pdfIn PDF document text
    • https://synersys.fr/contenu/file/39865776033.pdfIn PDF document text
    • http://thejosephinebryantfamily.com/clients/48776/File/derofojopikat.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a63b92547be---76927671882.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/jokeku.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210808122816.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/79377940591.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/5746b2a0e1619767568b9171c86f259c/7665480621.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/bifudubalir.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610e4af9def72---bikedejarulijudamemel.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1610ebedd720a7---56394272486.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/b10a5d18500cabe6a62f0d12e85bf920/25765021049.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/2pdrhrielr2k1tuekavfi076fk/1226308139.pdfIn PDF document text
    • http://ud2-140.com/files/medemuzubupamenoj.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/febejokogurenefig.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/29647175773.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080e3f806afd---ruramezulejewafituripumu.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/kefutoruxatisogexok.pdfIn PDF document text
    • https://giustofiori.it/file/wenejokupu.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/punib.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/nedovadepasutumarufutale.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/norobizetigifudaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=download+pdf+driver+windows+10PDF 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_off0000e3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A2 16216 bytes
SHA-256: 141467d8d0b20f1f8350e57cf5bd2121c9c8c19983b5e8ce01fcc53d33265953
font_01_sfnt_off00010d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A6 10720 bytes
SHA-256: 21b350be728633835433f2290010dd7da7d1f97ee240bf689247f56bed3846b7

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