Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22e819ea6c55324…

MALICIOUS

PDF

74.7 KB Created: 2021-08-28 00:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 946a09ffb2d4399b3b7f71e9044ef67b SHA-1: 500089179618c1fe5cf1a20cce754640f286b542 SHA-256: d22e819ea6c55324b330a2762bdb96b8ffdf759498838590fc1924b03f8324ef
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. The presence of external URIs and link farms on potentially compromised infrastructure supports the classification as a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ampletrekking.com/userfiles/file/40081363215.pdf In PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/0f44e0b56e4bcdb9f2e6549bf189a85f/vufamazexe.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210814_421E5DA98BCFD661.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/d5nkmhneepj1vs3a47da1jvg8d/jodapefivuvurupodurowiwar.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/29258f3baf5d4f20c350704949066d73/98063101655.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831f6d3aad8---wisegumopujawepapamuliti.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc251a69c3---58893324566.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/20815476038.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/48582723477.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/ludilowujomomimaz.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/a9b48583sgactrma8g6uj1ci56/legimida.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86c79ef93d---24042719550.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/u0vlckll070iqn01id7fgdp6le/zegagolatojugila.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/vilagivudakij.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/69543040792.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/jowugubedanugapubir.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1610f830ca6db2---96273085181.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/71423592771.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/wanupokikene.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/9a9c215321bd5cccd848597b9a593b93/kejuwo.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/9257977107.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/45918697469.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/4f60a1b852e46a2cce4abd89bdce5e50/69419514901.pdfIn PDF document text
    • http://envigest.cz/upload/file/wesefidajusilip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=we+are+determinedPDF 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_off0000c3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B5 10068 bytes
SHA-256: 3489c23d68fccb9f1e4f8df5cbb41dd7889c796cc0ccfc0c772fad0c1ea8ba06
font_01_sfnt_off0000da0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0A 16700 bytes
SHA-256: 6f7df492beedeba837fbe99a8321dc9eca03be29145554e6dfccb277b3578902
font_02_sfnt_off000104c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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