Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a3779600f433ba…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 16:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3028bc87e6142585723fb66110e92d1f SHA-1: f33fa3d139dd044b704d0c25338102e468bc203f SHA-256: 07a3779600f433bae071f41e1489496c58ea2853f672ed915acce9f8e86a91dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and potentially compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://medvor.ru/uplcv?utm_term=compare+fractions+decimals+and+percents+worksheets PDF link annotation
    • http://findingthegrey.com/userfiles/file/39472499213.pdfIn PDF document text
    • https://datajournonepal.org/files/fifakowasifiko.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087f6750d80d---xofubojafalo.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609844fbda204---fokeneje.pdfIn PDF document text
    • http://okun.su/upload/file/xijatogukes.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/xoned.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/6712410901.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202108142012516544.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/7es6tbf34s2himmneco73m8op3/24023330022.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/74401441345.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075e28ecd116---99631241923.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/44427720528.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/l5pds3lvdsb5e9c12uhsk5t30l/42577163395.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/xulazojukowurawekevi.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/889484455.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609916ebb49f8---nogodujizupiboruk.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/85529025723.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cd2b95fbf---68807299466.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/nowarebijutexogi.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/zafunolag.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/81379370434.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160733691023d5---35803768376.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/bb4cfcf47d8539c44870ad4be7b099bb/89855214514.pdfIn PDF document text
    • http://angel-juicer.com/FileData/ckfinder/files/20210603_E879A85E4936FAE8.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/1rm2ug6fjcr9jijcf1kr112ent/teniw.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/danalerejapepefomisegi.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_off0000d412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC29 11096 bytes
SHA-256: a597b94a048d90f4010be6f49ad78e2cc87411bdce1b08fd268051f238f313ea
font_02_sfnt_off000105df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 18376 bytes
SHA-256: 60998097f0a5f11a20d40aaea47290a49eb8c3874890d37430b6c5fbe41cc10b