Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5e8692ec6d081d…

MALICIOUS

PDF

89.0 KB Created: 2021-09-12 22:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1125524989a3c584f6835e3c787b96ec SHA-1: a1a11d1439c2227a8fccd940d25726f7ebbe7804 SHA-256: 8f5e8692ec6d081d91d988d113b072b0b459cd25afd3492bd4041ecb3ce8a5c4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, some pointing to IP addresses and compromised WordPress sites. The heuristic firings indicate the document is structured as a link farm, likely designed to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript potentially serving as an initial stage for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=live+football+android+app PDF link annotation
    • https://ooo-kenk.ru/userfiles/file/38698725849.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/f4f0ca0a6f92f6612e3a355a803b2f8b/ninabadibepiliziwudote.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210903_D53633A17FDFAFE6.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/80546919100.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-6/20210906010506244108.pdfIn PDF document text
    • https://jobtiara.com/files/files/gokiwoto.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/19631669878.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/4662135345.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/nugarigusolawuxarer.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/gatoxetex.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20935234582.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/0157d18f2560b90b880ab29cfeb08bbc/16795412323.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/lasuwotavogimugepuji.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/23234705616.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/66940177109.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/3068703371.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/dawaluvadomulowofipo.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/bepanuzadek.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/sirosajadabunujun.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b08100074119ec458c597d081800fb1f/fenapatikidisobisifedaz.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/9e50c3b00313c7478c9151f1898e82db/bozuzowewisatesuvetagusu.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/4t361gd01a8hi9jhmc21bmhdva/muvoduxodevipolekogoj.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130180070de9---83776785145.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/borexutugefozozosu.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394c7429ffe---virufu.pdfPDF link annotation
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210902141806.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210907140323.pdfIn PDF document text
    • 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_off0000f8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F3 10488 bytes
SHA-256: 684b1ca9c66a5ad77e76021c78d443a29f3f966d7db55b9bd31a805d1a467642
font_01_sfnt_off000110a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A6 17620 bytes
SHA-256: caec3fbba1c0e21e2525a84c147193e21edf7162a4101fdf16085435f5f22aeb
font_02_sfnt_off00013dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1