Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11ff5b00f7af4d2…

MALICIOUS

PDF

77.4 KB Created: 2021-09-01 06:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ec4ea17cf590ad83589c502782210784 SHA-1: d7a0a339ad96dd1d4cc35a32a294ce82157a33ee SHA-256: b11ff5b00f7af4d2684d8519a4ea502cd4cdcf3c097f79bd290e51287e18116b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a high number of external links, many pointing to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution via these links. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mujeresenmovimientoplus.com/userfiles/file/87451225513.pdf In PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/d6ba1032332ac43654816626fbd2a77c/86946861403.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/36947757161.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/70148642004.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51d7a5de47---zuxanuzilerofalemidu.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/3vt5620ntvgt84kf5i3goe3s2g/lovikewugo.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e227973cdc---46928410651.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/suzekilazelepimev.pdfIn PDF document text
    • https://datajournonepal.org/files/dokolozezitizegoluzo.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/83155695604.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/16485436334.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/18312682900.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/53542958972.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd40de1f50---kerobus.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/pdpfg8cot58geu76c22il118om/kalagola.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/31471977491.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/kuref.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/55609207666.pdfIn PDF document text
    • https://tigapilar.com/upload/files/zesibapukajoxivaroduvosuz.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969fcb45a1e---zelarigo.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5c40d68d0d57fdc98dc2fd2461e436f8/53074157594.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/88179801063.pdfIn PDF document text
    • http://bigredclassof1960.com/clients/879476/File/kadikutafobi.pdfIn PDF document text
    • http://billsky.ee/files/file/vinimabeguzewukog.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ae02b1b4213---jiriva.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/ccu8of7ot2l7o1seldp75k2et2/lexuperasijajubopabibumox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=there%27s+no+water+in+my+toilet+tankPDF 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_off0000ca79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA79 16992 bytes
SHA-256: 9069a6ea28022834ba822b806d9e982f4a85c4d39542a0d63e72f41a055c1e8b
font_01_sfnt_off0000f67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67E 10664 bytes
SHA-256: 8acf02232b0c14e2fb63614f916f9ec918de70f47890cdc9226aa11def5baf15
font_02_sfnt_off00010ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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