Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f40d2eeb1e8dd72…

MALICIOUS

PDF

86.0 KB Created: 2021-07-30 00:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 19e890aadb3f4f547fc903bc6e3ee6ac SHA-1: 16fd7b12ea397b99de0525f8690cc9ec928cc4f4 SHA-256: 4f40d2eeb1e8dd72e7b19d73bac102a817ce2c9a1a36a2c021013fef323d45a8
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute further malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly suggest malicious intent. The document's structure and numerous external links align with phishing or malware distribution tactics.

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 http://adveotec.com/img/file/tuzudusifiwup.pdf In PDF document text
    • http://solamsys.com/userData/board/file/jazekapuzixemo.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/lakoliw.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/776021d053a8c1b910901cdb87b3c1db/2012686255.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/waligozawajikunanufurebof.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/dotilifotikemivujiponata.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/kuninemoxokapagi.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/refogiwubexowi.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/modabasifovixiz.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/1530692017.pdfIn PDF document text
    • http://kotolantopeni.cz/file/33653590569.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/94612082428.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/xekuxipafizol.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/bimebujufir.pdfIn PDF document text
    • http://deforma.it/userfiles/files/sasizijibek.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/5080859934956eaad4830a337d824028/zegojovavuwo.pdfIn PDF document text
    • http://dentherapia.hu/files/file/xixudiderobaluxiwute.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/dunuvigo.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c071362db0c---gafemizet.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6760194f7c---1746554601.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/8b24fe303f289f88003f4591cbcd56ad/kavujuvepem.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f75c4d949---wetuju.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ad3187bec---41953015764.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/viliforisazuzowatesifajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=minecraft+download+free+download+1.16.40+java+edition+apkPDF 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_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001040a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040A 11300 bytes
SHA-256: 09ece4c017ba80f580a4412d6f4688f276b55d62363bfed28eb5ee6d6aa0735c
font_02_sfnt_off00011ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECD 16576 bytes
SHA-256: 1d1e5935f97fb55d2b05d453bfa74075b334108d46f39d8366c3ff7be6f9857a

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