Malicious PDF — malware analysis report

Static analysis result for SHA-256 869434aabf103194…

MALICIOUS

PDF

84.4 KB Created: 2021-09-02 08:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 61d91ca4cc5eb0f4d7d45c317e2cdfd0 SHA-1: 84338e2f46f0385c6cbfa9500f1686aa91e123fa SHA-256: 869434aabf103194b8f8f9d9b0a7afdeea1165cd02f29e3b4c1b6b53f2bb1d7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. Although no scripts were explicitly extracted, the nature of the links and the overall detection suggest it's designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/vodofedegedoji.pdf In PDF document text
    • http://yao-cheng.com/uploadfiles/20210717033106.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9348b4eedb---gogisezoterag.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/xevimamokewafob.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/20217518525.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/fasili.pdfIn PDF document text
    • http://446888.top/userfiles/file/55810807544.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/12711548958.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87ddcd8bfe---xupuvapavupikedurunoge.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/70842174584.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/69994598885.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/21826784594.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a71e896e13a---sijuxirusabukorido.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/vuzadekulufuvisazoz.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/sumekelalaz.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/28413959122.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/h19ndq5t70qh9g2quv60onv5hb/fopubebigajusenudidudaxek.pdfIn PDF document text
    • http://sns.hu/_user/file/82096511616.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/abb4bccf2333c23c0bf7018703e80feb/87515118979.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/nemamo.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/21915023191.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/12953399952.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/dja6q3beldaq4klimmk0db3o97/23738590219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=stormlight+interactive+mapPDF 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_off0000e5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F2 17828 bytes
SHA-256: 65a459f1a3a589a4befa0f01dd4bbfa3494a94436be0b7af74dc010a05b98d43
font_01_sfnt_off000113c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C9 10792 bytes
SHA-256: 1b4d25311da259f7da4add6906db3945e05a7e8bae6985c59d520920610c30bf
font_02_sfnt_off00012c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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