Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed39b58e69dd81b9…

MALICIOUS

PDF

75.5 KB Created: 2021-10-05 00:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: aa75e14ba85b6e4123ddbdf87a640b71 SHA-1: 5338b461219b659421a2a0d5588307a4d809ca8c SHA-256: ed39b58e69dd81b903e5b639951e5fd8036eef63bc606855cdfd033d9fd48dac
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites, including one hosted on a compromised WordPress upload storage. The primary purpose appears to be directing users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/jexofusapotifipob.pdf In PDF document text
    • http://gzmzwl.com/Uploadfiles/files/mimapug.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/39143935235.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/53262483655.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/9747160258.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/38547752909.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/levuf.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/847ce3db68ed6d5ec67d0e57cfc6d373/68456562900.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-17-09-55-53-On6yP7XZ.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb6dc86b1d---vagubaso.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/saxonavijez.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/dibarezoborogujogixiw.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/mageligumisudonirunodafat.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/xirix.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/tasozogevekez.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/93173813324.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/53516212378.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/gimebo.pdfIn PDF document text
    • http://shatalarab-llc.net/userfiles/files/75696740295.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/mafikidunutufovet.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/96119142048.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/71167086256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=biology+answers+appPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd74e2b5e7---4883610004.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_off0000c44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44E 10580 bytes
SHA-256: 21d3354119aa28bcd566d0513e3b0a26527802d160a95628be8f2c34aed2b531
font_01_sfnt_off0000dca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA3 17028 bytes
SHA-256: dd6e20aaa0faf4165610871f34bf272be45688daa8a9d4eb53781cab9fe8ab07
font_02_sfnt_off0001090e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1