Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd9535306ba95f6…

MALICIOUS

PDF

88.3 KB Created: 2021-08-01 06:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f0346749770d8b0d8f80fdefc7b54b0e SHA-1: 6271d809ab6d929231cb921b6d1ef346783806ea SHA-256: dfd9535306ba95f6a97d535634dd4eb7c231973bb315d3a1743812fb0d52cc5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to external websites. Several of these URLs are hosted on compromised CMS platforms, indicating a potential phishing or malware distribution scheme. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://digireg.ru/upload/72318344306.pdf In PDF document text
    • http://dui-antidote.com/images/userfiles/file/fijopuneduvej.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/54028964176.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/18753477328.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/59380754769.pdfIn PDF document text
    • http://hongdacable.com/d/files/85288237267.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/o35ffmu9j20cc3dq881bhighpj/tobuvemenajomeg.pdfIn PDF document text
    • http://schokobrunnen.com/idata/ninir.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/c58580fdb16e78172669df92c05b6a1b/sunexewebisegovi.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/59b29f5d76b309873a46ea742dc9063d/25489928544.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/11484087246.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/5b6b0f23de8d4c8815c1d81ffb8a16dc/43762671805.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/65094404895.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb75ef5cfed---95642053700.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906138145c6---21483664500.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/94945235968.pdfIn PDF document text
    • http://17njl.com/userfiles/files/xetokes.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/9091mqmrhe38qc6khkcror8f42/sebetifafidopigobobot.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/gakamafepisenigaxavuteme.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/29074570394.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c2a1d344---mifodimo.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c888850a0d---82729907805.pdfIn PDF document text
    • https://mnlex.it/file/fojivoxegar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mushtaq+ahmad+biochemistry+pdfPDF 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_off0000f001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF001 11228 bytes
SHA-256: af6dbdc29bac38c90b5b26642ac0ce6628dac67b6226eb88c9d3d4ebbb1d43da
font_01_sfnt_off000109ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12200 18324 bytes
SHA-256: 8c2592a48473b332a899e9e2361da4ca67402b0d9f73e7f57ba89bb6d7c196cb

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