Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d88b05668e76d6…

MALICIOUS

PDF

104.9 KB Created: 2021-08-13 08:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 80f244775eb0220b8b21b3c8187d65bd SHA-1: ea227f98e86d76d8082123fb2f7ef4f4cbfe5638 SHA-256: d3d88b05668e76d635070514208840103a5220135df76b22fb12b179c3d5d309
176 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 or disposable hosting, indicating a link farm designed to redirect users. The presence of a raw IP address in a URI and the detection by ClamAV as 'Pdf.Phishing.Trojan' strongly suggest malicious intent, likely to phish credentials or deliver further malware. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://resonanceacteurs.nl/userfiles/file/gupamokilakikudofelutala.pdf In PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608888ad31472---69123848393.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/72337448785.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927cb347e40---12835509927.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/78025202194.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/kuluxeve.pdfPDF link annotation
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbcb47cc91---68942362340.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/c533a62a4f27731748e1c9a866495aee/30157385433.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/vedemigenorimivowinow.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c9d2b7443---radagolugifuka.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/4b1413f2fa3e2e3d80ae6f0a6bb3128b/22730701294.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/damesatujopener.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16087f67a16e7a---nigilugegeme.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///vavimiwosuvatu.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/61437065245.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/52270078756.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/rulugenamejenituzosuta.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/6p0kpr6ccb90jvpvqnu6liguqo/54544947589.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/gixajunigil.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/zagobupewifubitiguwipik.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f36583c0b3f---tibemigejedijajudakimubu.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/xuwuvazodudideziraribara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=solution+manual+engineering+mechanics+statics+2nd+editionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00015250.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15250 22848 bytes
SHA-256: a269422ee538350a02e63b7ecb5072b7261a9cdfff6a098ab1054fbb94cfae2d
font_00_sfnt_off00010ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA2 17544 bytes
SHA-256: bc2bb0d35746c9c38c2700b4adeef31ff52350395c8ba1b482007119fae4b7fb
font_01_sfnt_off00013a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A90 11112 bytes
SHA-256: e71291d5cf05def65544ccdcbf98ab453761aa9d8dc75570e2463b23e362111e

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