Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eaba4b9c5b26fb1…

MALICIOUS

PDF

89.6 KB Created: 2021-09-04 09:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0b4777cec27cebf4a8542514ad61fb5d SHA-1: 3e8e803648d2c1284268ef82f4de822d0db46696 SHA-256: 9eaba4b9c5b26fb14ec8498c9967256f97253475593ce5ae115ffe4181c51a63
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 upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for further exploitation.

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://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9c77d7f0f---zegorax.pdf In PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/76102ff3d9ca41e6aa38a1e0373c19f5/vetukokunixufilu.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f71422eab---38499100577.pdfIn PDF document text
    • http://strandedtattoo.net/file/wujidobiwirunapevi.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/32099530782.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/raratanudofigagana.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/kitekune.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/10776923211.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/47714887683.pdfIn PDF document text
    • https://12tiga.com/contents//files/vijamekusexaletuvudevo.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/36720199082.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/74130059778.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/47483873610.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1627590227.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/kezatedivokorebowev.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b433ac8bc39---kiwugunijaxuvaradafitug.pdfIn PDF document text
    • https://htchninc.com/d/files/61652086745.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210904110933.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/wesudedi.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/gozuxevazez.pdfIn PDF document text
    • https://bselink.com/userfiles/file/23332233012.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/9966199007.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/fudowedoresipatuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ec6612+vlsi+design+lab+manual+pdfPDF 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_off0000f510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF510 11272 bytes
SHA-256: 7df46b99ff1d8951ef11092ba64822f2b16a75c21e7c1fe43eec3e3cbd093e42
font_01_sfnt_off00010f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F26 18636 bytes
SHA-256: 225c9c16b59449040219bcea3a21ce36859f124c166b96a0f7fcf7da6d2d99d2
font_02_sfnt_off00014080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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