Malicious PDF — malware analysis report

Static analysis result for SHA-256 3975253826535b3c…

MALICIOUS

PDF

93.0 KB Created: 2021-07-08 20:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 82f61946d25b2e44c8c2161d441535fd SHA-1: 8a8358d242bd59716255c53f3c478e141f7b0ecf SHA-256: 3975253826535b3cfbe20ff78827844d6c68619834fb02d70a04aa0d3d753677
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 or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://okazdedziecko.pl/_files/Media/file/17696410969.pdf In PDF document text
    • http://aldo-ins.com/userfiles/file/roronafizewekigoriwemitun.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/1dbf7a246c034ec45841ab6fc81744d2/xutezi.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/64816722229.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6a8dd4ec0---91176716071.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089791f16d03---12855441366.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dab180ba43b---sudedajorevilizaze.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607463f410938---32848621266.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/xevibikozewaki.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/moborubad.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f2007bcdf---dinekezojerofizaduveguxa.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/1a3ccdf67be572fdffbb9459bbc4da01/pawikemobesoniraneluk.pdfIn PDF document text
    • http://cecev.com/stockages/files/sufarume.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/laxetulojegufe.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/monudatidunopudumavavusa.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/51094601240.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/dowagokorodefa.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/655lnnj9hpcpe9tns70cdbtolv/84380350965.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160702ea73f2b2---keromejuzog.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4caf5f4c3---nowixalezegebijoposofumu.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/togilizigupupixefaroliguz.pdfIn PDF document text
    • https://anakmeong.com/contents//files/povutiloxewosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ms+paragons+home+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_off000109e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12200 10564 bytes
SHA-256: 17dd9c641ad6657f7c783655244068ef6ab47a01426ee8e8a290e97195e09ba7
font_02_sfnt_off000139dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DC 17092 bytes
SHA-256: f310cff9c375dc9b2606c46894a2166e51c6fe5a88a1081e169f9119d2b1f4bd

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