Malicious PDF — malware analysis report

Static analysis result for SHA-256 957d2b83f64f982a…

MALICIOUS

PDF

89.4 KB Created: 2021-08-22 04:38:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: eb826b36d1b087077d8e764d4709ece4 SHA-1: 316093d46e47a92e03a2fd5e0cf0cf1fc4e1455a SHA-256: 957d2b83f64f982a5b411bc291c81caa12c6aef5ff2edd9241aa79a7934a0f55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://star-transform-moscow.ru/uimg/files/sarasaxugosone.pdf In PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160788c6b67f13---tituwujobejofatinix.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/bavojokava.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/3a847c17df643378918759000007ac1f/bagilezaxufeso.pdfIn PDF document text
    • https://artbynela.com/uploads/file/35275305650.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a78ea669c57---8879204313.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/zajopunegegizepubew.pdfIn PDF document text
    • http://rentaruedas.com/files/others/25353895600.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082d76259993---48048295301.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/427475592d2234a959d16560a1d0172d/26061074522.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e13b5712e54---98984872658.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210509200915.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da7bd5a9083---96138668135.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b987d4c2265---fapujusivivus.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/43716825654.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/6e58e79908d2c7b23edf62f86057bcf8/wawativoxibowowo.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0f6e07813---nasupumesasasumobitared.pdfIn PDF document text
    • http://istanajpdua.com/contents//files/mojukipa.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edb738cfb2e---rujejovosanurumet.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/72445722438.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/4d66a9b605e009903500aab3700a4491/91660902927.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/68918007485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=fiche+technique+micro+tracteur+kubota+b7000PDF 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_off0000f9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BD 17940 bytes
SHA-256: 860717cb699cfdce1dca282b6e2c3e05efbc9ddeffc00699662dd1b2f1222e71
font_01_sfnt_off00012683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9A 10908 bytes
SHA-256: 4c6e76ed186027e141581e800715d549a14d98071b042855beaff1905cc580d2

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