Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d448dbe3cd20c2f…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 07:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b19e86048dd687d1c78a838ceba60601 SHA-1: 92c731e362f5e27c15bbbd9fe60946b0197adcfd SHA-256: 9d448dbe3cd20c2f8189b8c8b53dfaa4c85ed799b02be42eba24a6d8de13b046
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload directories or are part of a link farm designed to redirect users. The presence of JavaScript suggests an attempt to execute code, likely to download further payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=toyota+avensis+2009+manual+pdf PDF link annotation
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa10638fb72---tegoduxotusoxodedof.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/2f3bdudu70ecsk9qg8cmmnej60/63671645670.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/polerupi.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/58572736161.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210621025903.pdfIn PDF document text
    • http://philboyd.com/tutatugotivilug.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/xubeset.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/nopovizawapofaguvesupuvo.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/gff5533h0hk3cmqqhsdqbdt9i4/35501886282.pdfIn PDF document text
    • https://coevent.ru/upload/files/78251564407.pdfIn PDF document text
    • http://planetamama.ru/files/file/24327377494.pdfIn PDF document text
    • https://phr4u.com/files/83745937258.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/78772217575.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8feaba9fc7fabab4677aeb8b3f12bce4/fuzazoxolenuwuvifebi.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/1c43152aefa8273411ed0fba171fe786/49649594172.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161261c0aba549---14604252391.pdfIn PDF document text
    • http://mid-europe-ex.com/lifokaru.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/tuwixoge.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d68bb121d8---77130496406.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/zerofebunimimadaro.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/kuvagorulikosixaweluwaje.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/885aa028f241e37c7dbf0a4c5d454265/jarakifivitajabapu.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8434cec4a4---2365074458.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/35pnlbvhgpnnncheu50u5dsnpf/21622488380.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_off0000d1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C9 11212 bytes
SHA-256: 6ff084dcae92aa07e3eb2c3cc3ddf7eb1494d49fed045a7b2cfefa5b9ce44ec4
font_01_sfnt_off0000ec1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1D 17796 bytes
SHA-256: f9b2312bc4a7230b14e6361056fced105ccf975a6f158d70dcbb9d6e179276ba
font_02_sfnt_off000119e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1