Malicious PDF — malware analysis report

Static analysis result for SHA-256 fccead8c716cdd6d…

MALICIOUS

PDF

71.5 KB Created: 2021-09-02 15:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5a9f21b868ca48f612cd051214a863f8 SHA-1: b8d4ecb6af796a72d2d303866187d3a74ac04c7d SHA-256: fccead8c716cdd6df125fc6918c74c9ce429c2b43c226fdb6805eb5fa7b64a6e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to websites hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern observed is the use of a link farm to direct users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://queure.ru/uplcv?utm_term=estrus+synchronization+in+goats+pdf PDF link annotation
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9j4feq92075308g39qqc0sivq6/jitupope.pdfIn PDF document text
    • http://quetthe.com/upload/files/67230893228.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/fasakipatiduv.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d088513a9c7---1561946766.pdfIn PDF document text
    • http://iwort.de/userfiles/file/kekikijexiwebafurelad.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/tixetexem.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/sitinora.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/12564243847.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dc36d9088---99603468551.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607014c1e8751---59345427755.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16293060875201.pdfIn PDF document text
    • https://tepihtrava.rs//files/sibidivufelupegavu.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160874bb894ccc---33231134180.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e485e6d5a1f---niledifekumedat.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/18393501103.pdfIn PDF document text
    • https://oliogalanis.com/file/32392174236.pdfIn PDF document text
    • https://beliangka.com/contents//files/39849657326.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/mixalen.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccf96a3d9c---21711623379.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/77867132815.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/25339919068.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/soverupe.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/dewojogorosa.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_off0000b435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB435 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC47 16684 bytes
SHA-256: baaef8c36f597f4621ae5c65cedd50caf7d6dbdfb0e5e596aee1b9d7c892ad98
font_02_sfnt_off0000f767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF767 10976 bytes
SHA-256: 7323f9db11d02213481f6bb64e0a2a264b34085b03e6d75edf97b5d3a9e00887

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