Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42e6513575350f2…

MALICIOUS

PDF

86.7 KB Created: 2021-07-10 09:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e10b53500fa0c4846d38072aa2306d1f SHA-1: 3de2c2b915bd8fb67c5d599122ebeb05d2bd474b SHA-256: a42e6513575350f2f218df0858f66c1716cba7ccb55c46d7a0297e102e384373
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites. The primary purpose appears to be to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://juegosinflablesarizona.com/files/66592960634.pdf In PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ad890d7fce6---97644374045.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/4fd2014cd445b6f3134a0e57f95ff622/24490519768.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/f2a54a3d150cd44630e26ce1bf7de905/damenuludowe.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/84280731375.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0a8decc724e5efd875f72299fac165de/mekujevorukaje.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/kuvotudifalapazide.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/kowipemajanijiruzag.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/98022972192.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cc89ddd00---topavufefosele.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db3de20899---47402737121.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d42dce6364---tuvegezofexapovozobopadog.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec3782a691---jujejedutipaxudirikoxinos.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/22971091645.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/9801556815.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/ecc06117d7dfc0e919feb606b296b6a5/94632437965.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/kisivifowokularavinate.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/85412588866.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/83569188203.pdfIn PDF document text
    • http://mysistermyfriendministries.org/clients/85776/File/lojinewarorukipuxifu.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/m74l709c4rr0ag7964cgvbtc75/1983071969.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/15402864958.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/lizukejazeme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=apa+reference+dictionaryPDF link annotation
    • 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_off0000ef3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3A 17808 bytes
SHA-256: 3eaecf4a139239bd9cfcbe5911926254645ad854e26f116752c15f5b48d6fb84
font_01_sfnt_off00011e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0F 10492 bytes
SHA-256: 7e93886ebda5b832479d9ea5006dcf46b4aec5eef2f54c630623a67a7c317c42
font_02_sfnt_off0001361a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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