Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d78e36b0b159c38…

MALICIOUS

PDF

90.1 KB Created: 2021-06-26 10:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 98c3644c21b88a6201c444b2b956ce10 SHA-1: a05cd7026d43624085d2216247afc93ffccac5ac SHA-256: 9d78e36b0b159c38b838997d34f6dabf5fb2667dc2d18dccdc522e26bf9a2c54
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading malicious files or visiting phishing pages. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7735

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.
  • 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
  • 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://krisoc.ru/uplcv?utm_term=in4749a+zener+diode+voltage PDF link annotation
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/sapc2bjhrkehpuaa32crlo74fd/38732061880.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/jar959m8qp17luoj6bv149tc2c/daxanufoj.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/pilaxi.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/3b96ad9dfcd960303955d4f2b6a2acd9/lorofibinikovap.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/km1mtd071537rtk1ct2el354e4/dilawufevoxi.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/eb990bfd88fa11bd780979522727d2ce/34098720780.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/62796611505.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082599d1f924---41935720688.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/0moua8n6ac8m6tec5nnejvgge1/novinolizadiwipuxigore.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/fojojofuzorivadobipudifu.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/tugazadifeguf.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/87370415372.pdfIn PDF document text
    • https://clinicscrm.com/img/files/93459028235.pdfIn PDF document text
    • https://airshow-bg.com/file/7760480020.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/hr38695cdf2emi7k299kvdr87f/wiretewipuwepexoro.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/musetigo.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb2489a87a---25453907052.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0e8cc5818---15646621174.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/27547410533.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071034b48e6d---dupodapadidexadozizepu.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32df884daf---57997922546.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/8231127994.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/npress8144gnmqehl7aapqursr/72933220758.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///66346613609.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE664 10628 bytes
SHA-256: ef9cb3762b8317832b8150813f4b9e515c324d6c9345d23c4b61aab86739cc68
font_01_sfnt_off0000febf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBF 21660 bytes
SHA-256: de49657586798714bdc4331992357e4c01258094bc7e1764782482ad245a4fc1
font_02_sfnt_off000138b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B5 16992 bytes
SHA-256: dcd2897790a96c9a8ee9dfbf2f7dadf456f85733b9a983c72ff42d3b35bacf73
font_03_sfnt_off000151b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151B4 2364 bytes
SHA-256: 21637ac39a5a5e7658cb8b060fda420b016eb5a4253f2abd075071f45200a9b7

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