Malicious PDF — malware analysis report

Static analysis result for SHA-256 089780e009907557…

MALICIOUS

PDF

86.2 KB Created: 2021-09-17 10:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e6647e6ab1f1a615ce0878400a5e73ea SHA-1: 502f0f24295c8ba0149231a0b9dcada8906cbfa4 SHA-256: 089780e0099075570d6e3ec8c61e501798447c918ec0f46f7d54ed3f5f2f439f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm characteristics strongly indicates a phishing or malware distribution attempt.

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://catamma.ru/uplcv?utm_term=temporarily+block+apps+on+android PDF link annotation
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/e7adf69eb415e4707f46016902f6a9e2/kozari.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/soravuroxumadiw.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/42989043332.pdfIn PDF document text
    • http://konberdbio.com/upload/files/tejexofafurupovemel.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/xowapugilepogafobikiv.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/xineboboraguvaxu.pdfIn PDF document text
    • http://iwort.de/userfiles/file/74123374048.pdfIn PDF document text
    • https://camelcarpet.org/d/files/86785233313.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/masosozebivedox.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/95469085286.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/65953511713.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/sikugimofarapikigoxozo.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/sekexuremuvuraranepuluk.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/pojazofobazogarurapebir.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/minozofebejixozigux.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d28df58ffe---nesogexogezunupajosed.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/buzuji.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/nevizegabegazudefag.pdfIn PDF document text
    • http://expresskaliski.info/file/32498289566.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/gizinepebatesesuguduros.pdfIn PDF document text
    • https://maymac.info/userfiles/file/xeboledifarisusubuwale.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613487a08d14a---lobedasutufaribudujibuw.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/12495300708.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/jopijanerikidote.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/35167015974.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_off0000eab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB9 18056 bytes
SHA-256: 7e1f73356c72fdf57418b8bc3390ecb8009dff682762643620b30a3476e2def4
font_01_sfnt_off000119a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A3 10888 bytes
SHA-256: a81908b06ce07db4cd0d9ad79571e4154f6a5c1222c0869e94f2c42dbc2b38d6
font_02_sfnt_off0001328e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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