Malicious PDF — malware analysis report

Static analysis result for SHA-256 eab3a603d957312e…

MALICIOUS

PDF

75.3 KB Created: 2021-09-30 12:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a17806b77b771bc6512b0587319d5835 SHA-1: 9d395ee46455731a630efb11b7514c383fab2dfd SHA-256: eab3a603d957312e488621d33f2694ce6a0ac57b6e689c10c104f6b77f207271
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis confirm the document's role as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://888nv.ru/userfiles/file/sarelekukarewusibowi.pdf In PDF document text
    • https://cakkue.com/contents/files/tigivorimo.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/wudopam.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/siseradejasirifer.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465c3bd9fe9---pulut.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/70094862366.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/70344399783.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/zuzobarinulatojisemevi.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/87992507424.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/12054619794.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/61906647385.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/fazinovajudu.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/91288227790.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161518c7eb8370---93701594002.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/nakejoduti.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b8edc8832849f8f8cba319a3e5e84ac0/30388202988.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/pilerikupuvofekajat.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/dababuborigug.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/xikanarap.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d8cf60cf3b---rulifixerawesevojop.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/68721277280.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/56372953251.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/35834037461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=windows+10+for+pc+full+version+downloadPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210929/16329166843189.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_off0000bcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD3 10936 bytes
SHA-256: 9d2d4a9557be2551b71b251f8ec486f32d343ec8f80c15a2143758f0402c7696
font_01_sfnt_off0000d657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD657 18912 bytes
SHA-256: 57e2e8c788457734c13a3b4ef4571f38dc34ecd0fb1313bf9105b296388de67f
font_02_sfnt_off00010759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10759 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1