Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28ff71eeee152b4…

MALICIOUS

PDF

79.5 KB Created: 2021-09-05 05:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cf724c8aa973326fe69daa8087adc191 SHA-1: 7214d589bca8f61bbdfdc5cf33e69ce834521189 SHA-256: a28ff71eeee152b4392a4d4b69afcda5f17ab64e9c9c71141d8959e90ef6cd5d
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports this assessment. While no scripts were explicitly extracted, the nature of the links suggests potential for JavaScript execution or redirection to malicious payloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4229

Heuristics 5

  • 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
  • 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://drafthe.ru/uplcv?utm_term=rowenta+compact+power+cyclonic+ro3731+manual PDF link annotation
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/fde30cb4c0f7a72da6d8bb5b5c783ddb/raxirizumunagif.pdfIn PDF document text
    • http://cutskytools.com/d/files/90075486742.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/12gbq0m4o0p107ov1i8bhsujo5/87322007316.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210531032318.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///sedemixe.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b4b1af576---zopuzifotoxipomimatilori.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af61863f20a---29889910059.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/zovasuzumavowusaxev.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/6a860709abfc64550b33044ac3cc7521/rupizutonab.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/sisazaselatuw.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-4/20210504140026523631.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/xozukokex.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/50393529642.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7a257aa24---41152698242.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/momisejijarovib.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609836fa59cac---31381693627.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/74808748683.pdfIn PDF document text
    • http://candientuvibra.com/images/file/bozuwasakewaxesepazusaku.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da956e1011---87521020725.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825cf7c7b10---14185655758.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15492602004.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a143e2bc78c---41831516935.pdfIn PDF document text
    • http://inercial.es/uploads/files/zojatukolexipoparujuzeje.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/93202373572.pdfIn 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_off0000e28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA2 10988 bytes
SHA-256: 99a21f57d4dc2205a1eee4d4f442d223be3fcf76cd45090c9835c1472e5dfe80
font_02_sfnt_off0001144c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144C 16436 bytes
SHA-256: a8871c56c01b3d7819068ba8673603c4df152f114effefe63681313d00144c58