Malicious PDF — malware analysis report

Static analysis result for SHA-256 756eac76c11bba6e…

MALICIOUS

PDF

70.6 KB Created: 2021-09-24 15:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 33842dba46fa767f6e551f6db5ba995b SHA-1: 62d1ea6d57e831fff20316e77d657dcf0a1dee42 SHA-256: 756eac76c11bba6ea97d2df74e2d2f9534bfc2a07917733c2c55a02a5dae0275
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. The presence of numerous URLs, including those hosted on compromised CMS platforms and disposable domains, strongly indicates a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=how+to+send+contacts+from+android+to+iphone+6 PDF link annotation
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/db241h9bpeo4e5jithrs2bk0n6/27014252581.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/36690970657.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/92162861623.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140049421839---zonoralor.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/60499692627.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61489322355.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/66663704843.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/449194186.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffaf5b2f6d---8375647565.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/numuvuvupinet.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/zomipizakexizoxuwe.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/62698596361.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/reputugakaripuvajawibozaw.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/11522815717.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/vexopesi.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/77498559265.pdfIn PDF document text
    • http://momsystem.ru/public/file/24825207990.pdfIn PDF document text
    • https://obchodsezlatem.cz/upload/files/mobagojakix.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/76718366915.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/funise.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/75791211652.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/gusosebabilesi.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210904_70F6D396F65288EA.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140102d6352e---20443423007.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_off0000b17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17E 15528 bytes
SHA-256: d9e2ca8a574a14fb1bf2764049bb119ef529d5096946201f1d55ff23706bccc7
font_01_sfnt_off0000d895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD895 11084 bytes
SHA-256: a63d569327cca96fc937dff296135d4f60e64e18e71fa5ae51bf375aa2d223d5
font_02_sfnt_off0000f243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF243 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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