Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4408ba0d24ab25d…

MALICIOUS

PDF

81.2 KB Created: 2021-09-02 12:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 107dd620847f918a9e0d24cd271ad754 SHA-1: ce8335b1ee352f1b1815d1d72585515f683c6fb9 SHA-256: a4408ba0d24ab25d4a3086f5a279211a4684908225295c5ac7845a999a18c839
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://thinhhoanggia.vn/Images_upload/files/vadamesebasebaw.pdf In PDF document text
    • http://museeducuir.org/upload/files/mulamomejotenukegibop.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff242a6249---gopemupukumumidopi.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/mekimakevomemagopalu.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160904cfacc45d---bobes.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/d33e73822782609900a782675081adbb/74064760758.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160dfffe3ab91f---vafonidu.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/susifovarijitibupipojawex.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/8e4912c772b636ffcba5705fa8888bed/35333285229.pdfIn PDF document text
    • http://becucci.it/userfiles/files/64479393336.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/kagonunerunuj.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/watosixevamukum.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611444459989f---46099904574.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607653bbedcdc---85169151874.pdfIn PDF document text
    • http://mosjob.ru/images/file/vexakefesawofazevadej.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/35677976539.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/e9p90t0st0jpbphf5s1qjpfeo0/netixovefoxokewelog.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/63097403994.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/75917069733.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/votamigav.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210718063302173.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609860bfe22af---tejikopedabowimaxurafup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=conjunctions+and+prepositions+exercises+pdfPDF 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_off0000da21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA21 10932 bytes
SHA-256: d126fbfa3bd7b165ba19114cb00347b383e7e8411bcb45bd9446a26d75042cde
font_01_sfnt_off0000f3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A2 16816 bytes
SHA-256: 998ac99b6eaa86e9dc45c0d13f9c9357fc5e24b14b16a780045e49c8f0ea5c96
font_02_sfnt_off00011f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.