Malicious PDF — malware analysis report

Static analysis result for SHA-256 cabc405e1e6ef278…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 05:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b42f5700edce4c89b77f6f99411cf852 SHA-1: a21d4cb651ffb07f391d23b1e415966cbeef6df7 SHA-256: cabc405e1e6ef278f75321327ae3f708467ac38d3ba8877f21112a5dca9d2915
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

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://drafthe.ru/uplcv?utm_term=descargar+whatsapp+para+android+market PDF link annotation
    • http://4998horo.gmmwireless.com/contents/files/dareru.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/c1hdlo7mbo9qvr2bffssu07227/84276054766.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/4417257760.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/93962172137.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/sulimixixurutigizi.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddad8d8610---81626421214.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/jumuwisudubifele.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/kiroxewegiwixijiwukozu.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/gimaga.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/gisoxubumewaguvafuzif.pdfIn PDF document text
    • https://electroagro.es/pub/files/99815073744.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/paxikojafewiwaxavulepo.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/77822621667.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c00a15c7b1---78153851194.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/78711025293.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/f0706ad036a12806fff9a5fb52424c61/dewowilali.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/nufozito.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/zaxugutasal.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d40d55699---6417329065.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/19024081884.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/sadagek.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/18090290001.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/911676295.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/gojerasoki.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_off0000daf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF8 11092 bytes
SHA-256: 03e6adb0ec8a106c2e41ad7434463391134bbf98085c37d562e6562c10f1c566
font_01_sfnt_off0000f48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48E 17648 bytes
SHA-256: 9bbca81e265a865996a1c7aa36ea8534f3a8e1af74585e54e4c197f0adebcbc3
font_02_sfnt_off000121a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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