Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a92ea5c65d51a03…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 02:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a96f439fa267cc4a32fc44c1ea4b56ac SHA-1: 573887746a4948e7a57631d7448dd39f7a8bb77d SHA-256: 8a92ea5c65d51a03496b15465894e2a3e8454a2732399137677f5daaf5429e3f
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, with many URLs pointing to compromised WordPress sites and other domains, suggesting a phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and the structure of the PDF point towards it being used to distribute or link to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://valeneighbors.com/userimages/41529448121.pdf In PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/82f14e916272cbca7a655cc09d4a7f74/tawenesed.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8db379b75---16469894656.pdfIn PDF document text
    • http://allasclub.com/campannas/file/rodinowoxefibore.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/32919488775.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/75913893511.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d96b66ae0---napevewevomu.pdfIn PDF document text
    • https://udruga-invalida.hr/files/timerokopimofotun.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/golijejozonugezomelufen.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab4de4dcc0---17364324003.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/52048050958.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/wenupusowe.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/31003024094.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/18501330690.pdfIn PDF document text
    • http://domplus.su/userfiles/files/pumaridebuvitutoruf.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e25e8d6ee92---47044824599.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/6378c3b44dfe06cb2d959eb46f15b8a8/78375622996.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/54cca96e9fac2702753bd833693e63a2/12720169672.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/67806764925.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa9f8c15e01---19577128618.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/fomefo.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/zojubolalilobubo.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/29079213240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=independent+variable+chemistry+definitionPDF 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_off0000e61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2C 18184 bytes
SHA-256: 50a0ee7ca86e212be2dcf995a03fd00b48811e17f8cf1119d40032e7f8e9993c
font_02_sfnt_off00012e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E04 11156 bytes
SHA-256: e649a840f6c25c1da82714b15f1dab7666f8001fbed6e882c8f17554a38b86a9

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