Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7de324744a2e149…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 13:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c3bd6c13f674b3ca1403414fa96aa446 SHA-1: 2af5222b0310dbdeee983f664c3877639f18dee7 SHA-256: e7de324744a2e14900e1521e83a50f0253d1f453ba71d2577e4e6aac5d575630
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to direct users to external content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086751ee0405---giwejuben.pdf In PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/161c0a10150b9a8f20b66a7c87e6f64e/57347920697.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca9c4ede0b4---5262792565.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/zabosixezilegavobumufado.pdfIn PDF document text
    • http://www.ximangsongthao.com/app/webroot/uploads/files/zinim.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/92222384182.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ed468a711---xekovawize.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efdcf76a51---3844382858.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/52497137092.pdfIn PDF document text
    • http://szpk.hu/_user/file/72072770860.pdfIn PDF document text
    • https://ghnservizi.com/file/91819428973.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/luxuf.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/gefibeb.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/c7c49c5c6fa5fbc67a2f0433eab884b0/dabimasusux.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/44095627409.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/49089724654.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/26268155782.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/97620571278.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/tv7gnd42fbq8qa1amu2qe8h07o/latutunimasagu.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/15555882865.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de159a573cd---48715563829.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/97947303658.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607958f399c04---ledidasufowuvar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=middle+school+the+worst+years+of+my+life+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_off0000df78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 10972 bytes
SHA-256: 7e23225fd7d9e844004c70d0cb8648052c77f6149605062c6437f83834d9ea54
font_02_sfnt_off00011113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11113 17248 bytes
SHA-256: d8b1e32eda774b8df8fb873d0ab95aea9557341c58fef987a0f7f506fa3359dd

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