Malicious PDF — malware analysis report

Static analysis result for SHA-256 4414edcba9fa3f4c…

MALICIOUS

PDF

84.7 KB Created: 2021-09-14 05:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a482051260a8c3f25ac00e4c7ef8091c SHA-1: 4524b97cc7a1e0072f1b368b0a3ac3f47d0b2a51 SHA-256: 4414edcba9fa3f4c4b0c588cf9582ed7eb511acba42c99f386c7c6efc1308054
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=touch+and+go+1986 PDF link annotation
    • http://niezapominajkowo.eu/userfiles/file/21784074194.pdfIn PDF document text
    • https://hirurgija.me/files/danikonigaverofupo.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab24bcfe2a---74308011714.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/dazolizi.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/92081243125.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/33105410491.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/figejupumexetibe.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/delowad.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/navivapegomaf.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/15920802435.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/jurexatiduveworinolawetu.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/34339880110.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133bb4a93eea---94047505105.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/linelirogij.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/51687558479.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/dofopusiwiv.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/jubenuxusufa.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/98098175707.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/buxatolazisujekagagan.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/bikilipelukogowizexaduvup.pdfIn PDF document text
    • http://guitarenko.fr/img/files/runedadozojijonunovi.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/zilaxeberovof.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318c7201611---pupipumug.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/gokajujomarotexo.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16137197d4a6c5---filuwaxeferele.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_off0000e508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE508 18608 bytes
SHA-256: 7cfbdfa2a096485b3ac7b768d685fb88a1fc00101129b9c92b0d8b49a5a4568d
font_01_sfnt_off000114f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F3 10672 bytes
SHA-256: 7ea2add4b98956b9e5c6f5794c5fd522888c68162ff5060aa58ffd8258b40c3d
font_02_sfnt_off00012d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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