Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8cf78274276347…

MALICIOUS

PDF

71.3 KB Created: 2021-09-13 16:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 43417fe2dadd4a5b4ccf449300882242 SHA-1: ae0717c0205f1d34fbe07767b468873f10ea9641 SHA-256: 2a8cf78274276347a3a5bb14d96c05f8a92edfe5db1e5f38ac703dc1edf8d5b5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://udmvdpo.ru/images/files/fogisanugenar.pdf In PDF document text
    • https://tessuno.com/upload/files/613cc68d55649.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ziletunofafip.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318173d2efa---fovupo.pdfIn PDF document text
    • http://tnhmc.com/userfiles/file/6303266369.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/lodajudu.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/sivabumituvifakoxexopemav.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/24042067757.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/ff97eccede9b37f0eb6efc97363d2ff0/43883559086.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/95953219146.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e9054831e89f33b1a5e3196f2326d72e/tuvodesukisoraxuvibuze.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/70815251753.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/xadugowe.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/buzotobufu.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134274e6e489---71120958556.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/99865200604.pdfIn PDF document text
    • http://livestocktool.com/d/files/bipesozaduvogedok.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/wodivimulaga.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/67769040390.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210907161300.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/zixusodafomuxerig.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210909/file/1631196664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=forgotten+pattern+on+androidPDF link annotation
    • 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_off0000b58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58A 16728 bytes
SHA-256: a3fda6980d21a6d41323bff9a6233cbb081071295616b82600abd37f844b4dac
font_01_sfnt_off0000e08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08E 10328 bytes
SHA-256: 2dcffbd7d619f7b0acaffc1e13259486ea4555d236a93bb51d07dce644508e54
font_02_sfnt_off0000f7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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