Malicious PDF — malware analysis report

Static analysis result for SHA-256 2806d230a9e16cde…

MALICIOUS

PDF

71.2 KB Created: 2021-09-09 01:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f14b03fa60868252a35210dc31d0d1e7 SHA-1: 45752195499ac94ca6493fbf7b6dce9c203492fd SHA-256: 2806d230a9e16cde159b3aff0ce33aee3a04dd1e1dec59365170e039d4c42d2c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple potentially compromised WordPress sites and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://prestinireedcorp.com/userfiles/files/tekozufufinolunilo.pdf In PDF document text
    • https://raiporjai.com/piceditor/file/47438708943.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/44510341582.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/21368225395.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/melixoti.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f35f0d8fdc---33003891688.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/57239063343.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/gusefeseluxozim.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369c1f1445d---nivujanamipibifuro.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/kolazozawowevemawaf.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612efee80680f---47311874286.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/fodapasegizepelijog.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/rijufawe.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/wosofovobigudawafumugamu.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/xoxubasagapisezopeganewe.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/zusebuvula.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/janened.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/selezopepurinid.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/40791256660.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/zegilap.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/19881321360.pdfIn PDF document text
    • https://el-tall.pl/pics/file/xesavagetalapipij.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/lawaberik.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210905_095156.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/3e9dcbba69754efd64be6130b38b7fad/9641922940.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/25278156733.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/41794740233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ib+command+termsPDF 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_off0000b8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FA 10484 bytes
SHA-256: f62e6f0cb45724cc9e69626e0d283f433e5a0994eef9fab7d1c3e4c4cd995469
font_01_sfnt_off0000d0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CD 15248 bytes
SHA-256: d2b051e294d319c0668b02e15f380730b49f4165df7e45b42fbc2111f5e364ea
font_02_sfnt_off0000f6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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