Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa43634803ba080…

MALICIOUS

PDF

78.1 KB Created: 2021-09-11 10:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e7eece936390e767688e9db09fdf73dd SHA-1: ae33d3226d96c458b47dbdaa483ea89a133042e5 SHA-256: 6fa43634803ba08040f6122817bb39ad434a2d85ebb1c553a76f29af7964c3f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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=tube+video+downloader+apk+download PDF link annotation
    • http://avvolodin.ru/upload/file/miruk.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/7993651921.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612feea28424f---87017405509.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161302ecc53259---gizitetivijeneravawono.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/33883290169.pdfIn PDF document text
    • http://ecole.ru/text/images/file/tulumizeguv.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a1ad25e35---rivijeturezanazerefi.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/nibofutazitinitozidaguf.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-10/20210910074917614342.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/76666753065.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/85668153417.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/36679101199.pdfIn PDF document text
    • https://value.ae/userfiles/file/dinarewu.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/fixofijefudosa.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd4ebc386---4361579000.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/96516111477.pdfIn PDF document text
    • http://citty.org/images/uploads/file/22047742574.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/wavedetanebegenagovonud.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/vikeguruxu.pdfIn PDF document text
    • http://guowangcable.com/d/files/gobokakoganenegor.pdfIn PDF document text
    • http://foxadv.net/file/63001495176.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/52306462771.pdfIn PDF document text
    • http://amdind.com/userfiles/file/meximaletikegudemeloz.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_off0000cd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE585 10564 bytes
SHA-256: 597327ff9b34b2690afc0b45b298518a5780a165d66d6dea7653130985dcc724
font_02_sfnt_off0000fd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD81 17656 bytes
SHA-256: 054f6cc5619aea29a64db18254e5533634c0d125bc18e837e0ad120fff7a9e07