Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4ab4283983d660…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 13:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5c524c940539d12f5ed44380f47d7ee8 SHA-1: dda468f0d2d1a0ba365732c72da0f5cd754d36c6 SHA-256: ed4ab4283983d66097470a132032f23471ef1f19c36ed7eb291c2096463c2b53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The PDF's structure and embedded links are indicative of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/3raun03sjngsfki6rtgvbg5l71/67164750456.pdf In PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abfe9c9cc0---mavutorifukuvozow.pdfIn PDF document text
    • https://wineart.online/userfiles/file/78159284337.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/sigawidifopeg.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/79922923620.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/bisunoxenanilomupizotupas.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/81334675832.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/zitimazajizuposo.pdfIn PDF document text
    • http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/64521533618.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/mukoxesiwofesalonuvosa.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/jukuxetit.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160af9708bf94f---bajinorovukagalitofor.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/kixixefewefajupasumos.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113c5f86a122---metosomag.pdfIn PDF document text
    • http://carolinaboatclub.com/userfiles/file/75207701227.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/xizixiwar.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/zugedusapanado.pdfIn PDF document text
    • http://soc-in.com/data/media/files/felemobesekewopupiwaneri.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a15d503a450---nimukineze.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ce88e57c49---55670849042.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/68563209344.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7311145833---parexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pearson+education+inc+2+worksheet+answersPDF 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_off0000d2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F6 19288 bytes
SHA-256: 3a57d17f981457e20bbbfc17db637c5a3b0b12fb93c0a369a9b005c6e9774fb7
font_01_sfnt_off00010468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10468 10820 bytes
SHA-256: d5d55a9e1d5f4ab65a36ef2f1a30a32f59d87b7b76b28004472e2d33eb131e7e
font_02_sfnt_off00011d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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