Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b2705f2a20561c…

MALICIOUS

PDF

124.4 KB Created: 2021-08-25 02:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2cc4ed700351008a227ca81c42ebdc43 SHA-1: b59c7b81090589be9f19b9e3c5b54819d06524f5 SHA-256: c0b2705f2a20561c19fcf299843f4aa5c2f550db84560e0e479dc1e341639010
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://adria-ex.com/images/blog//file/11165017913.pdf In PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/97053250492.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/9834411425.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/42666907359.pdfIn PDF document text
    • http://ovodatar.hu/userfiles/file/17939865176.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/42359158049.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/mufarepu.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160773ad3001d6---jumepenaxowodotut.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/pirilukifixapekum.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/58317401094.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082da32dd46b---68139328066.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/330180fa1d98264d11ad709c832ce065/39105313489.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210720_34A68DFC23C5BC94.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/93797403260.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/ladigunukerumi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b631d72a7---1425636219.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/75395393937.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/677cf51772a167e9a26da5ff1a45a5b2/rulopivepuvafometemub.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/xomewokofotimase.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/41551627511.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/20231720953.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adb2bccae0---julup.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/nomuwowutolunora.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/porer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+witcher+3+decision+checklistPDF 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_off00018107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18107 10616 bytes
SHA-256: 529411846088547f955e49a5165e5288df76e9950eeba3318dfa627c8675e75e
font_01_sfnt_off0001995f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1995F 18756 bytes
SHA-256: e8487692ee0944858281466278f7fe605eaba25a741c9e79b278ad69c916cc93
font_02_sfnt_off0001ca77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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