Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4ab5ec2e28eff4…

MALICIOUS

PDF

78.4 KB Created: 2021-09-03 03:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2b5b81d77f73888242d07a44023302b5 SHA-1: 515ab5f4c49c7fcbb786304b2e99c9997daabb86 SHA-256: 7a4ab5ec2e28eff4d92fc0b90e613f673222ab2d1ca67592e99d95fb467e4cb6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to multiple distinct hosts. The PDF likely attempts to lure users to these external sites, which are hosted on compromised CMS uploads or disposable domains, potentially for phishing or to download further malicious content. The embedded JavaScript is a common technique for executing malicious actions within a PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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=na%C3%A7%C3%A3o+empreendedora+o+milagre+econ%C3%B4mico+de+israel+pdf PDF link annotation
    • http://usmleworkout.com/files/file/17776854171.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210629181453_3kyzw3.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfb59f1497---6968806640.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/zemulekeruxowugulem.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088668a2c789---vozuwufoxasex.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160ab16502d001---38328153650.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/pefiritejezuxam.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/todezesabizozuxevigudase.pdfIn PDF document text
    • https://pellevah.com/upload/files/bumivojalalisemimep.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/gipofowuwikipimosas.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/55fqhlgvlqcfln43kfjgl2s75t/xezorezejorekipopuxopo.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/kubefupamalitu.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/23693935998.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51ffea3431---viberolobotepi.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160749584ed0f8---44839105772.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/90604683647.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/93868771431.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/25784134930.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/ruligaxenixon.pdfIn PDF document text
    • http://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/35430325208.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/mijedamisujuvi.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ca7fd9a29eb---memepizunuwuwexoxadar.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-27/20210527051925414720.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_off0000c704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC704 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF16 19500 bytes
SHA-256: 1c67f6d01ba59d3cb5b3a710307de7667cfe389491fee1b5e6566ad8a284df89
font_02_sfnt_off00010ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE1 11452 bytes
SHA-256: 2eac4fbdd8f512baaaddb11b58790089bd3dcd592b0132534fb1f3b52c6c9578

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