Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b4a4b85ddd8a35…

MALICIOUS

PDF

74.7 KB Created: 2021-10-10 02:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ddc0926e8b659b49dc30b4f3109aeb92 SHA-1: 80ee103c24c09df2999a1b19a0a508d7b3bbd867 SHA-256: 64b4a4b85ddd8a35b866d1c00c90f9b77bb89eb1d42a903dc2d6f659d6949b5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=oneness+with+all+life+pdf+free+download PDF link annotation
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b87645e8f2---20492540906.pdfIn PDF document text
    • https://yasacompany.com/upload/files/40115392497.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/57949491285.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/sewusidalidir.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/pomutip.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/15947505361.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/pobexizusuvanexiseve.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/gezilomavuvege.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/kavisepuramekizoluz.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/45885902258.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/f1123bedb52d0051abed1aa3dae0f489/xerugiwox.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/50128870920.pdfIn PDF document text
    • http://dgkno.cn/upload/bagomesoruguwelivasoradob.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161588943bba22---setepeliz.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/zesajafalejaditurufowu.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131313d652e8---36106059120.pdfIn PDF document text
    • http://kngsm.in/userfiles/file/mebituxofijotadopemizew.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/22288570809.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/xizuru.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/24148444083.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/81226224669.pdfIn PDF document text
    • https://scmsgroup.org/ckfinder/userfiles/files/lifiwuboriliwaluperape.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/14134300789.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/ritoxabelol.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_off0000c1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C5 16712 bytes
SHA-256: 756c8d72c0adb0b1e0a0597ee57f72c90b64c4b1fa6a3d2f162f1d3e4054f2c7
font_01_sfnt_off0000ec67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC67 10704 bytes
SHA-256: 2b22e7fb17131d4a4d1b32495c0f9a5f06fefc705f5a9dc1c0611aba5f6ecb1b
font_02_sfnt_off00010500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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