Malicious PDF — malware analysis report

Static analysis result for SHA-256 e340a4e93e71036e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 03:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b3d2bdd60d6a974fa729360f5df4a7c9 SHA-1: b7ddffb9f36fd20f404d4784cdab0165b9ac3d21 SHA-256: e340a4e93e71036ea3c6ef3c31d587fc600bb9e9ce6186e126a0a4386b814ab6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely serves a malicious purpose. The heuristics reveal it functions as a link farm, pointing to numerous websites, some of which are hosted on compromised CMS uploads or disposable domains. The primary attack pattern is likely to lure users into clicking these links, potentially leading to further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://benardoutlite.com/admin/fckeditor/fckdata/file/nopixeritomo.pdf In PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ca81adcf8---70042393764.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2f83941b3---xedibetodil.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/zuwurirexinawin.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/gepipijokaturax.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077329ba6b5c---10409374753.pdfIn PDF document text
    • http://bankerz.in/qpic/files/zomotimemebonixuso.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/nuwawelugavolokokom.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/3111141355.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/xolubilexome.pdfIn PDF document text
    • http://popmetre.com/news/files/dokad.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/21d72f376da103924526f9380dfba897/58802385903.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/f89a48e633a8b9464936cb8453543df3/24779632124.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/78148044886.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/zazamejuzizodetewokapanud.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bac629da5---rusaniwibupipu.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/3983421920.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021072009210496.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8a7aae0953284aca362886bb493f6e11/43177196118.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/ba80f4a8241a723a9705a0362feacdc8/lezus.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/f3bcb28dc59d31dc05ee6917055de767/xogazibetegap.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c68fdfc9daf---48918583493.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/17442483809.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be105f725fd---lemewutetodamodemur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=advanced+java+multiple+choice+questions+and+answers+pdf+msbtePDF 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_off0000dd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A5 11536 bytes
SHA-256: 42e0b391a9c5f1aa1d165a457eff361aba471fed1f7254b98f753f2238caf8de
font_02_sfnt_off00011061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11061 17824 bytes
SHA-256: 1681edbbba63a70b6cac4bbfe63ffccb15129efc567e63c8f5b4be814b3633a5

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