Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16b260252aee415…

MALICIOUS

PDF

87.3 KB Created: 2021-09-12 01:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 119a50aae9b0d749a5dd8688b91259da SHA-1: 37b5abaf568f8142d00682fc6687401a1a632bc8 SHA-256: d16b260252aee4158bb1a5c65f5216a8cbd672cd526f89262f1131eccbb4b73f
156 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 CMS 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 distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the primary attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://allytemp.ru/uplcv?utm_term=android+allow+pop+ups PDF link annotation
    • http://nickels.design/ckfinder/userfiles/files/86595759525.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/97483537127.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf27ee786a---32748728351.pdfIn PDF document text
    • https://jetaime-shop.com/files/waxoxomukotu.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbc36b25bc---20658344411.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/4bc0cb0071587fe2514a96f1e2181756/guwawejixarafeno.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/vowiginagiwebepoxipif.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/gakezavufe.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/19026091557.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1a807a0f0---mawaraseb.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/wevewapikenudos.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/suvusetiwibonuravoxiju.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/firozoxaduje.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/68200863945.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/nedovamojovev.pdfIn PDF document text
    • https://rippa.pt/files/file/6770807275.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/91371467325.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdfb8acb84---gomeg.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/jafapoxe.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109021130044615.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/43192205428.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/mazemugujexatiwave.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613267bb3519c---62434855283.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/rerena.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_off0000efe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE6 18556 bytes
SHA-256: fb04716b25b84419f8c10c305b321ced73f971ba8b1af058a742ecce4b1fd366
font_01_sfnt_off00012001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13818 10324 bytes
SHA-256: 93140fa5a310cc4b0389edf148568934835d60125e284a4ab2fa7c4eb1e05449

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