Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad601a74c580ca9…

MALICIOUS

PDF

74.5 KB Created: 2021-09-16 12:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9a65d2bd8acbb6837182448e1e1cc0fb SHA-1: e96ff093db93a81fb154994d847b2e4aaf669300 SHA-256: fad601a74c580ca93ea0e4a49176fbce7bd7c1542f28837fd74f1b4bdced79d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards a tactic of directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://inwebjor.ru/uplcv?utm_term=live+tv+apk+for+android+tv+2020 PDF link annotation
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/wademutagur.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/gemapuvosepegumetaru.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2d4b53db6918f588667faab2f698339b/wopofakebi.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/904ffc642f0056f37ead1a7fad8af72b/38877337737.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/9991504435.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/vujuwigiluluruwejoza.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/94049018033.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613befc9c4264---26615450545.pdfIn PDF document text
    • https://schmitz.cz/res/file/sowujez.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134add0bd318---dilokimo.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/tevojo.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/gugejozigiz.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/sonori.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/89545303442.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/97482482176.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/nivenetaxatuzi.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/kexikuzezutujeniboje.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ae2119c12---41045481784.pdfIn PDF document text
    • https://seikai.jp/free_images/files/16573902448.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/jogazujozili.pdfIn PDF document text
    • https://linardi.ru/files/file/65061322296.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/xejumonulegavok.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_off0000c1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C9 10632 bytes
SHA-256: ec839455d97218020c5bed4cce2c300bc082430300dc546b82b2ad7981e6c1c7
font_01_sfnt_off0000da46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA46 16308 bytes
SHA-256: f17a8460aedf1e7006e1dd47f7136f30eae7db6b1fd9122890494b1f4e2c19be
font_02_sfnt_off00010433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1