Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea321334cfd6bd3…

MALICIOUS

PDF

75.3 KB Created: 2021-09-04 10:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73cad291a7413112a163b365ffedb281 SHA-1: b39143f1f0b78460d25f686a74d5100a3348ff21 SHA-256: 4ea321334cfd6bd3583bfd962c53f0eb97957be8b31a4923f222e5b194c0edc9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://kondicionery-fryazino.ru/upload_picture/file/tumikeko.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2980cfb216008066074e8f71760af7fa/fegasim.pdf
    • https://gjbuyerbroker.com/userfiles/file/pibebidazamovunimu.pdf
    • http://huh.hu/UserFiles/File/nalagosusutiruwav.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161234329f3134---ruvelivezulasumoku.pdf
    • http://maslatalaia.com/userfiles/file/muzotumaripi.pdf
    • http://bjaimama.com/data/upload/2021/06/file/202106272250151103.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9832b314c---lasovetan.pdf
    • http://print-resource.co.uk/ckfinder/userfiles/files/45141293095.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857c740796f---levuxagubiloleb.pdf
    • http://scandirent-new.ru/uploads/assets/file/nusoxaxujukogevizadafetav.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611da483d8e2b---79566100503.pdf
    • http://4seasonstours.in/userfiles/file/58211856059.pdf
    • http://innova-perila.ru/upload/files/ledenufiz.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b6150b2f7713fdd1fb985b80bd31f271/69039273720.pdf
    • http://quaint-house.com/97812310150.pdf
    • http://magnumprint.ru/upload/files/26884626624.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ed6b85853---vudatobamogipin.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/p7sa42lj94ijghl1g8el5f5g72/18864073750.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/1lj3qqpbe7n26mm9qpm8l66jif/54770947381.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/sns182olu2ltm721ajcaq0q470/9274572482.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/5144897831.pdf
    • http://www.tractortools.cz/ckfinder/userfiles/files/64155020206.pdf
    • https://alshuka.ps/ckfinder/userfiles/files/xipepuzikelotuxiwafap.pdf
    • http://soncongnghiepjotun.com/media/ftp/file/dujorusa.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f3f4a6872---bexevobujozevijula.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=mozart+violin+concerto+5+cadenza+joachim+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c101.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC101 16792 bytes
font_01_sfnt_off0000d913.bin
5b61d8f61a4c7138f71f359778c279348ff88a1d2811fe825ac1f74c75c5a690
pdf-font-stream PDF embedded font (sfnt) at offset 0xD913 17144 bytes
font_02_sfnt_off0001059f.bin
d4b15635d9561eeaf91d3ab32903ddbe52da395ba2fb745984f05fa0b611a30d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1059F 11100 bytes