Malicious PDF — malware analysis report

Static analysis result for SHA-256 6565563e769c467f…

MALICIOUS

PDF

89.2 KB Created: 2021-09-07 18:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b295cc2f34a855d2ec82f7014524626b SHA-1: 725bb6e773d73dee0420da0d02f3b01ce775a42f SHA-256: 6565563e769c467ff38290dc207f9df357e43664f147521e91f0b130f9c7acb0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and does not provide clear textual content, but the presence of numerous links to potentially compromised sites is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://espacioschillout.es/images/admin/file/12532469706.pdf In PDF document text
    • https://zivotzaokny.eu/res/file/vavarepe.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/jetewox.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/zugaxakabagozixig.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abb11b127b1---40133702265.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/60387614049.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0a375ff9b---75840170871.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/gatumudobof.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ddf0c42ebb602433414e427d827c8d79/midesasizaw.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/33724503475.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac653423f8a---mexizizazufumetowokev.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16108434cb6c92---94409369393.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/72759fecfcbea881b352ee9f182430a4/37510370991.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/ralepilupomenax.pdfIn PDF document text
    • http://erictex.com/ufiles/files/54157565088.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611ad2176576e---99423947034.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/bizolufoja.pdfIn PDF document text
    • https://qnzar.com/files/42206261967.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087edf772604---35335296410.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/g1fr85enfst75dpncqv9jrftb3/18658176374.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/5720952888.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/11777453745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=customer+experience+research+paper+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_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 18908 bytes
SHA-256: 76d529c60a6997a24f0d166e04fffc2731869b3c6140ba54859c5da998f23b0c
font_01_sfnt_off00012594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAB 11072 bytes
SHA-256: 173ebbdde5354d3114e52102d3abe827914bba2e40b414fcbd9e1d684743edc0

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