Malicious PDF — malware analysis report

Static analysis result for SHA-256 608e7d0122b31617…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 11:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 05945e0a21baf089b03fefd26530f4ab SHA-1: 36be05d20831f9f993ffb2272a119bb10071c64f SHA-256: 608e7d0122b31617a16a286611d5856b56f5e8ec507e001ecec611d32e9ac8d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://guapa2.com/admin/fck/file/38122604776.pdf In PDF document text
    • http://dj-venci.com/uploads/pages/files/fadipuredavopit.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/gojerinawamaxumuvijoguw.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/fadoma.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/77300502586.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5362e199cc46c17889a071af26aaad44/rufivasomozezuzudi.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210916032346577.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/97482966966.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/98996557667.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/31578111654.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/29842126462.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f55b928a9---wirekipatopilifozok.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210913_A98CD4B53383D659.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/0f50368fc73f64d78e501d78e6c08f97/lamatidatus.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/vogikilulekuberese.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133da68dd814---51496574218.pdfIn PDF document text
    • https://proxkimya.com/resimler/files/takadirolagudurolake.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/durudetabiromopevererixek.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/94025514844.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090603314482.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/jagun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=android+studio+button+to+new+activityPDF 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_off0000d38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 18336 bytes
SHA-256: e7bc1c8a04c71b0f4ec23ae9780a4b73265f908f51144ce70b80225a3937d67b
font_02_sfnt_off00011c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3C 10804 bytes
SHA-256: 980dfb98deb71567c50071e6dc59a91bb4b90d206c35c6401c1cd8891fc494d5