Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b94fcaacd30109f…

MALICIOUS

PDF

95.0 KB Created: 2021-09-19 11:38:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5494ff75dd3957097f18e2dadd584e3c SHA-1: 220e2d275eeabd17d349728db42414b7cf8a2b75 SHA-256: 4b94fcaacd30109f43111afc1b5e3f3ed8b3cd1568b2ed8467a4ca37ae6edff8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=free+load+smart+apk PDF link annotation
    • http://xn--h1aeekk.xn--p1ai/files/file/zaxadupofonixegifiger.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386fd20ccc8---toralokolisi.pdfIn PDF document text
    • https://webmenuplus.com/images/file/20622633497.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142774f7a758---digitufijovinu.pdfIn PDF document text
    • https://o-dance.com/upload/files/16983033392.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/gavejurogobewala.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/giduriguxiduji.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/5925782498.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/59797946928.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/mobufitijevogovipesum.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/nuxizomulevijabamat.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/nujawixegupofi.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/13862636612.pdfIn PDF document text
    • http://husplaza.hu/editor_up/10332602715.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/53717986961.pdfIn PDF document text
    • http://abwva.com/uploads/files/jovinowapamadusone.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/varumediv.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/71086344368.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/79224009511.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/xuxopuxagum.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/3cda37ae004247d0b12d606e966e6a8d/zagosexofidugaruvi.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613decd104d34---lelajemeviwimu.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/1962051031.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/4308784533.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_off00010b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12354 10428 bytes
SHA-256: e5598429074e403994c64f436331f9fd51e6d16bf2e02365167ab2b40b4430d2
font_02_sfnt_off00013af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF8 19864 bytes
SHA-256: f05032303430a0074f4b8f646255504e8271f107be030262dfd21be68bb9a2b5

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