Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd14f8d0b2f58a4a…

MALICIOUS

PDF

83.5 KB Created: 2021-09-07 17:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d8846d647806f53bee262a014ce3878e SHA-1: 51359a8c1b07b4712918fec307f45f1afc585220 SHA-256: bd14f8d0b2f58a4ae5b34684abaa0fb32733c0dc624392967426d53a7189b18c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm used for phishing or malware distribution. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://ytovietnam.net/ckfinder/userfiles/files/venedu.pdf In PDF document text
    • http://agcslohian.com/userfiles/file/62170986979.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b38185d64e7---vakavapupenavepasunevewig.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92491770523.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/87092679830.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/59135952707.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/60093594442.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6172f96893---jiwetaguxunifenox.pdfIn PDF document text
    • http://acelybio.com/upload/files/jawaxolanituxi.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/16275741387.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/3f0af7914419ab870084bff84929b4a9/41310316753.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078732aeed2e---50347304510.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/77761094251.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ruq6r43sha6eglcfg8sp280k74/bekoteben.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/08/20210830095823.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/sikusif.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085281ce89de---jofutojowemeseva.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/4ccc9ac0a13a1208679f56486716cd11/22087225304.pdfIn PDF document text
    • https://healthcareadvisorsgroup.com/wp-content/plugins/super-forms/uploads/php/files/3qmkj5llklnou3uqvf9rov29q3/masawinisoripafiva.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/xakuxuxosipoponorujarum.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b80e6a7254---45858492836.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/tujutagukuk.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/hbk82ctgv1g3hsjir05qirfe97/18032663454.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610544fbce6f1---69946806441.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/ab201fc3af0be03c3f0596b0a0bdfdc9/rijifozo.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/c819ha7ag90fnsa8kib3v6tmgd/12701070428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=declutter+your+mind+free+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_off0000e38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38A 10664 bytes
SHA-256: 2f032bbd9741c1b7e95b2897cbbcaf3b5b370b1ac62e5e352ccde2f43a9edeab
font_01_sfnt_off0000fbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11406 17148 bytes
SHA-256: 14dd79cd3cc3d66640f191a7f67f00dcb8c2c36551ae41b2da24d9d0f9b78e3e

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