Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8898c4748714fdc…

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 11:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 64d343793c2eba97bf63d3b72cc8d20e SHA-1: 597199557c5fe5de9dd7fae551d390796b3fbc64 SHA-256: b8898c4748714fdcb930c25852ea4536a32368a9fab51c6c505a2021ac43947b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=true+phone+mod+apk PDF link annotation
    • https://vilnius.cvzona.lt/resources/img/files/86199769454.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210906222516.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/lubof.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/7e1fb216916354e4997b0e538b344aa0/34789815700.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/36870320680.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/60271272223.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/1acb3d3bf126ac807c245fa3eddb64f9/57740439047.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/84616721333.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16130df455a6ea---41458014577.pdfIn PDF document text
    • http://ropesadventure.com/d/files/gopibekanerelikovovure.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210915_3D417475A074C55C.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/68794293543.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/81966098932.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/sanidukepugubi.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/xipilinefozopipaserulif.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/24949305273.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/40299496933.pdfIn PDF document text
    • https://vientangluc.com/upload/files/pexitefuzorunizerebodoxa.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/1986126832.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/dizaxidefabezo.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/41933547770.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/sedavoxobizodopod.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/34905554220.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/xudutipisig.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/49789503105.pdfIn PDF document text
    • 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_off0000e1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA05 10408 bytes
SHA-256: 104ee4c43dbef24b984d773ad2974242f17012c3fe4c927824eaba8af8ad9a52
font_02_sfnt_off00011155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11155 18244 bytes
SHA-256: 75e6976c7be0139414ef87d2a852732a88f6d58bbecb1faf0deab4430ac0600d

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