Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0f18235ca7ee951…

MALICIOUS

PDF

76.7 KB Created: 2021-09-03 06:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e75331344137244ec4d33450f0ffe770 SHA-1: 3a16e83cdec75a0c0f0433790ab86fac5752c813 SHA-256: d0f18235ca7ee951c04afee861e06afc9afc4ba3524432db7757085caa7c3125
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URIs and link farms pointing to compromised websites, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of embedded URLs and the nature of the heuristics indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=paracore+coltene+manual PDF link annotation
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5871aa7485---gonorodomevobaxumoxoribu.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/13106631576678db90d20426fa1eb841/pafumo.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/78912258003.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/71251951423.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/pononabomubufamo.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210616_EE0295AEC1D9E80C.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/nixetivudadosewogi.pdfIn PDF document text
    • http://jarosi.hu/files/file/razasogamopufedowe.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/tuo2bku839cc2su9m119ahs02u/21077256176.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/272cl6dd38qaijntaftcd7748a/24869635054.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/gabedaren.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/e1e9ae077f05a0dac385a0479d344475/kinorizitalimekilogek.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/lidirejomutuwarimapete.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/govagapivuzidubexopugafab.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/sinibogusamola.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/muwovazilibusu.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/n9nfn045j7tu6h0hucibqes4a2/wamutibizozo.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/zusidenubelurirefevubip.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/bizibuliwasilaw.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/17519795412.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1afb7a99fc---dazatibaparaledov.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/50f2967254b612d7f7fab324d0ccf433/72287282051.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607ec4c6059c3---2993976361.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f798a4bce8f---fapilowazel.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/18552926531.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae83a60ed8---livubagorunexuvomupowogeg.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/c452f6c9950016458a4dd2c0b2635a65/63755109084.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_off0000c98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98C 10232 bytes
SHA-256: 8c6e58ac2bc2bd5a22dfcd424b62e0dbbbbb04650c59e8776d341648f712f3e0
font_01_sfnt_off0000e08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89C 17308 bytes
SHA-256: 2fd0aa26f4da734ea0b859b7a77a1daa797798d3d12dfcbeee0ef3abf7bc7572

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