Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c4394653323e15…

MALICIOUS

PDF

73.8 KB Created: 2021-09-18 00:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6fba8ad452976af39bfaf83529338f35 SHA-1: 0e3f803c8286372b0015256858639777d7595e60 SHA-256: a3c4394653323e15957904f0bc60c886b049c20655d90357f6b2f6a1b605e58f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, including links to compromised CMS uploads and disposable hosting, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to external sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 7

  • 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
  • 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=speedtest+no+ads+apk PDF link annotation
    • http://ccsl.asia/files/27774895574.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/bebavegavotuto.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/tedarurasifupiju.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bb5665844---3991240379.pdfIn PDF document text
    • https://mandaljeebanking.in/ckfinder/userfiles/files/29668356792.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/98271579287.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/99248130144.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/64048952583.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/dfe712a5a8296f103b036cf079d470c9/kenuladawidamisibojo.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/kafixipubeg.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/66707572363.pdfIn PDF document text
    • https://durimawar.com/contents/files/gadikadoral.pdfIn PDF document text
    • https://dm288.com/slicice/file/kovogasupimepivixugiro.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/7631097794.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130e8f89abc7---melewulikiniko.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/sekunefuwefapevujan.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/sozanufifuzobib.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/vowujumax.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/zumopevil.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/63832740850.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/genazawer.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/busakujibo.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/14434690393.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140bbf77029a---15993360093.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/lekubatavupujolinokoxasir.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/rijogivorumulufog.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/fimogofibilegodeg.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/kijaxo.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_off0000bced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCED 10316 bytes
SHA-256: 37a2511b8deee70f795c0b7f3090df2e7115b526aa0797bbaf347f5f0a16d9a2
font_01_sfnt_off0000d44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44D 16708 bytes
SHA-256: dca5bb723abd9ee09e2004cb962912f5eb87a9e1eb98f8ff188c65abb94e189c
font_02_sfnt_off0000ff85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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