Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28389a0bf52144c…

MALICIOUS

PDF

68.7 KB Created: 2021-09-21 10:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8368d308520ce301114af286c2ea0e8 SHA-1: 05c7c1787e8cc8b8a6cd6b7e2f1c6e887063cc29 SHA-256: a28389a0bf52144cfde06bbd3de7237b2513185de4f78991458e0cfce60a46d4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The document's structure and content suggest it is designed as a phishing lure, likely to trick users into downloading further malicious content or visiting malicious websites. The presence of embedded JavaScript indicates potential for exploitation or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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=lightspeed+virtual+machine+apk
    • http://bilateralmatters.org/userfiles/file/87535407284.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/snn2bkhj92thd3g3c12in81fv4/wibamoxemufafuveke.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/njmmbked4om2gbj06tc40viqo0/wapagezimiminewotus.pdf
    • http://phamtrangia.site/upload/files/87425848020.pdf
    • http://smenergy.kr/uploaded/file/20494444116136afd0b922e.pdf
    • http://ageofwonders.buka.ru/sadm_files/fegivaduxibilotumewetiko.pdf
    • http://cbestdesign.com/ckfinder/images_store/files/67964372761.pdf
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/90896635356.pdf
    • http://business-baltic.com/myfiles/dok/tetisofadoka.pdf
    • http://p-jtech.com/userData/board/file/wugutawogafomaxukubonubig.pdf
    • https://z87992961.com/upload/files/20210914185332.pdf
    • https://www.assofmt.org/ckfinder/userfiles/files/86141822687.pdf
    • https://cafemocion.com/userfiles/file/buvedexujunatofivizigixuf.pdf
    • http://wolfroccatiassociati.it/userfiles/files/raleraninazorowibagugijex.pdf
    • http://playbabydoll.com/userfiles/file/61929642507.pdf
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/89286711565.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/efd2436b64de1e7c75751b80aeeff07d/lisufin.pdf
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/35687548730.pdf
    • http://orosweb.hu/ckfinder/userfiles/files/16934125919.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ume2dfbiv0d74t3fbp1uo2tdf4/pajisofekemibamefavukem.pdf
    • http://loveperfectionschool.com/upload/file/jejelegolufitizofemapita.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af76.bin
88332807007024fbb97bc0ac7dbe9b5db8c11fc251064d06f8c8599407a61837
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF76 13928 bytes
font_01_sfnt_off0000d1b2.bin
ab462d3bf5f913ab0c8a16a8d2bbf4b275720c7fc8001445591b33991d8d4fd9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B2 11056 bytes
font_02_sfnt_off0000eb15.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB15 16792 bytes