Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c76b5b4b5f5c2de…

MALICIOUS

PDF

91.7 KB Created: 2021-08-25 05:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 56ab0fa35cd740b4fe8e1c0f5d184e13 SHA-1: 761699a54f0e9d5060ef6b5a18129fe0605696a2 SHA-256: 8c76b5b4b5f5c2de0e9bb2f36c98682883dc0aa6d7c0d261fca5e0693dbdc35f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/thcn9qnesod6o7ghjou8akn0h4/rilofozi.pdf In PDF document text
    • http://banglenhospital.com/UserFiles/File/17534325696.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99181090597.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/74053590118.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/d9964ad0d23d72a4d713762a105dde2f/mutikutekenafamujijijix.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a744fa8223d---96687576027.pdfIn PDF document text
    • http://ibb-online.ru/f/file/16047455858.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/75171457140.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/96594120279.pdfIn PDF document text
    • http://4darchitecture.org/img/all/palineno.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/824a2efcda3df550f8561684d09275b6/5719527522.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/tavejub.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/78665101628.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16088297c8969a---82987319506.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/1ca2ab3f9807dab666c914e4872c6c9b/tijojikixetagimapomorojoz.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/49f33f205fe5de7e8f6c21c598ba21b6/712350633.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/19248387573.pdfIn PDF document text
    • http://samtekelektrik.com/files/99909682910.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d854d30f04---vovukagosegujaronuxa.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/rakoxenotewuw.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/15053542948.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/punenesawosij.pdfIn PDF document text
    • http://dztechfin.com/upload/file///tumezubesugokimek.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/avpba52haf6c7t7jbspm6vs962/jexaboxusojevovon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=date+in+numbersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CC 17740 bytes
SHA-256: e1ff6ca77558a25fd526ce542644a0c3e0b7a5fb780bc220ec04ea89d7f272ba
font_01_sfnt_off0001246b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246B 2948 bytes
SHA-256: 52ff38eff9445288ddb8c187fc8c01b64b9428a0f4585ba3cf72b8ac172d481c
font_02_sfnt_off000130b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000148c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C7 10344 bytes
SHA-256: f5d13d8da7714173e2e38866debcd3f4438112c2fe7b9e4155db23ecdb2cf856

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