Malicious PDF — malware analysis report

Static analysis result for SHA-256 229d5e0922780de0…

MALICIOUS

PDF

86.7 KB Created: 2021-09-04 06:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 00eca000192feaf8a2dde7ac7adf61b2 SHA-1: 61c17bdc78483b88937eca5be84603d2af292882 SHA-256: 229d5e0922780de09a21e3e40d77baaccdeefd2cec191b8260ece9f374b1e64e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristics suggest it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting sites, likely to download a second-stage payload. The presence of invoice or payment lure language further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/v8cedf9288vnisq03eu4s314c2/88247842011.pdf In PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/bd0515c4ee2e803904afc1a683dc853a/tiwifepinowunimesirex.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///14588296569.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/pazoxofufit.pdfIn PDF document text
    • http://classtool.info/upload/files/1332021071.pdfIn PDF document text
    • http://odumakus.com/uploads/files/nukemapajujajuranobawozor.pdfIn PDF document text
    • http://harveyfamily4016.com/clients/5/51/51a16c7d09a65bdad6d3cd8ef7da6b4e/File/zigugolojusugog.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///98649945699.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/ponexaxar.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/tusesuterogasekidogakimi.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/87ae1mq09vm3fs5tjenbjomnb3/2498976077.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7be6fa675fdca998eb45570abce77882/fubuvugowobofilegalabe.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cb54782ac35---pisetobaxevosen.pdfIn PDF document text
    • https://alkoplast.rs/files/vozamulapebisid.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/92094811147.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a9c666ab7824103696434bddbc0bcd76/75386276390.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce9514652c---16230488376.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/zidafad.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/37937646174.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/ximusewak.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacf871a90---jagon.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/0766cabb9bef1ebfd732e2eddf1210cb/fojedamipatar.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/junupuxexubigafi.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/28948965139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=vaporesso+luxe+manual+pdfPDF 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_off0000e858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE858 19256 bytes
SHA-256: 6f96d198f9a1aed3442093c227ff08d8d0b493d682fc33124e5b8c87f3d75103
font_01_sfnt_off00011af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001330c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330C 10640 bytes
SHA-256: b4ca254715cd3846f74c1f899db6ee7781cc751285d020d47e3b0d7ad4c9d3bd

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