Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4327a2e0b54625…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 08:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1ce3fc70bd39cff4bbd71a6964add65d SHA-1: 72f61179dea037ded4ff6c57250c2103e8863176 SHA-256: 3e4327a2e0b54625443e72fec5eaa1fbe4a06d4c17c1828b217f2fedd95e75d4
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains malicious content. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised CMS upload storage. This suggests the document is intended to lure users to malicious destinations, potentially for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://zovsh.com/Uploadfiles/files/71404959565.pdf In PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/wizibabodugor.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/28910494012.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/8e9fc63c596153723804f831f9648a01/tukot.pdfIn PDF document text
    • http://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/zixexuturer.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/66517804832.pdfIn PDF document text
    • https://ahha.az/userfiles/file/58910004657.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/9d2de5cb123015ae8e911b85b9576481/14372857205.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/navano.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/08b01f71eb581b2090223987c861f17a/21435987904.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/xiwinotetamovufozip.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/moduvadusixoluf.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096395f4e779---valanex.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160aefbd0b33ba---lamemopipilovu.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160da217b247d4---juzorunepuxejuwusujogutid.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/wabik.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/49636976299.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/fuwesimoweke.pdfIn PDF document text
    • http://myphamasia.net/upload/files/jidajagikekugezemak.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/kurabololunitufunekazaniw.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/57555386065.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999671b96c8---bakazigigolat.pdfIn PDF document text
    • http://rideco.hu/upload/file/71987949773.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1612aefc3e7387---29171189354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=acgih+industrial+ventilation+a+manual+of+recommended+practice+free+downloadPDF 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_off0000d6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CC 11300 bytes
SHA-256: 7f02c90a3e4e90f7da6412203c983420c34c7bb2b6cec04474da6d2bfc4a2c50
font_01_sfnt_off0000f10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 18108 bytes
SHA-256: 40821d8303b736c2f2e84b5dfb66070ca5387c0e05668652b7d4437847b89266
font_02_sfnt_off0001206a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1