Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a2514d0b52b99a…

MALICIOUS

PDF

85.4 KB Created: 2021-09-21 04:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e5412abac6de796d3a115b4aabcd13a SHA-1: 584322bba15f6d14ee39cd1f9b89eda3249ad97e SHA-256: e5a2514d0b52b99a0dc40bcf740453c7ace0ce19bc36b5a3556b3cc1197dedc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=friends+season+10+episode+18+online+free PDF link annotation
    • http://www.larucheapain.fr/ljk/file/14473853846.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/14899005422.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/23260515455.pdfIn PDF document text
    • http://airzo.net/userData/board/file/zumemejidibenaso.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/bojexibidurojirexasujat.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/sifupoturutaguneruxowale.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/5606927665.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/gopib.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/juduraraw.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/44674639731.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/godabab.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/tuvajidasovisodano.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/95ea80d6d531b513623fc23acc69cc13/92758935341.pdfIn PDF document text
    • https://www.confirmedtour.com/files/serosidutoram.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/7468b22d57909d3c107a28388836b6ac/sewutefawod.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/82713033599.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/zukidibilufalepin.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/97708545499.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/30155233395.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/1a6541c2ea9dfa8817b8aa2e4d03b23b/zobitates.pdfIn PDF document text
    • https://majubesar.info/contents/files/36085051520.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/vupipixomikuxotite.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/bikazuxijozuwo.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/68631285291.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/60263525074.pdfIn PDF document text
    • 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_off0000e445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE445 19776 bytes
SHA-256: b2a6b06be56e9b511921a2fcb342e281576bb231f99e1f579d6cbffe8918611a
font_01_sfnt_off0001175b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175B 10752 bytes
SHA-256: ac99b4e2aaa4798b1bd9653291ee6c069aa64be6a42fc65ac2781fa98f70f10e
font_02_sfnt_off0001301e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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