Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d2270b9f643da6…

MALICIOUS

PDF

86.8 KB Created: 2021-07-13 22:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 93d726f2886829d1e024cf8df35d3b29 SHA-1: 0ef28da3fc95e34d46176406b27d48bf7675e567 SHA-256: f3d2270b9f643da6f35fb8004ac3ac259cb0d54d64c3a01bb87dcda09dbbe809
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. The presence of multiple distinct hosts and the 'utm_term_redirector=True' flag further support the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://yjccnc.com/upload/files/8607115973.pdf In PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c896a7d67e4---veneworoteso.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083fe570457b---57603360001.pdfIn PDF document text
    • https://avvocatoboretti.it/file/66743863276.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/g4t9rr4sf65ttgqacjm59a4897/46617935879.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/5651027187.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/setiloze.pdfIn PDF document text
    • http://healthywithhart.com/res/file/9584229671.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/54218576336.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/a141ede484f79f3fffcc8eb09e14c91c/jewab.pdfIn PDF document text
    • http://bjallstar.com/upload/file/97505210487.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/bajefuwenotibadaji.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071e7bf431d1---80502351425.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/81946bf0a49bbfbd9673678073a0068c/44835997145.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/3t73embkea4dfcb1q1ckauj6h5/51078386451.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/pekumazinolofowas.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/wosagufejim.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/4522833136.pdfIn PDF document text
    • http://petrduchek.com/files/89084368985.pdfIn PDF document text
    • http://hoggard1975.com/clients/a/a4/a43fc1111b7ad4318f8b553feb79a890/File/19039745080.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/zadugisovifilozuki.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/7gp1l184mvteg6qhi9fp9vnc26/22776133456.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/78822870283.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160748c56e992f---12533349073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+long+can+chicken+stay+frozen+forPDF 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_off0000ee61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10673 17652 bytes
SHA-256: 5b78df427d34524b7de3305f8ec8dce4a6b5d5c29eeabad90fcfdc8c13720ccd
font_02_sfnt_off00013488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13488 10960 bytes
SHA-256: 24ab7a97664c147f342d5960c657e0c999d3f8fbad2a3cb14d6fb8859d1fb777