Malicious PDF — malware analysis report

Static analysis result for SHA-256 a087c62d935d46dc…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 08:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 270a70fab9b6d68b6c53f2ca38cd9ca4 SHA-1: 3a512ad5a2601ffe452838f1520a376cf72b16f4 SHA-256: a087c62d935d46dcd0b4de55ee7916fd8f005237efae96850730df0828d7878a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=menstruation+calendar+pdf PDF link annotation
    • https://kristinanamaste.eu/files/zujifagufasakexi.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/271247571866.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebf81464a4---72511173047.pdfIn PDF document text
    • http://richfieldhighschool1969.com/clients/868116/File/93016681640.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/lakifiputa.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/083c40038f5a35daa624bf1036215e28/5671353881.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acaafb5121---87688813888.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/07f1123ae8dc54a3cee9c98f6f0c19ae/18960063292.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/19742505735.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896a95b7e65---72196678778.pdfIn PDF document text
    • http://keiganproductions.com/clients/863431/File/32365605754.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/1ce51d38f4acb7c57562754b20dafe24/negiganejusuwusax.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/popikovijiximamesikunav.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/20087242646.pdfIn PDF document text
    • http://beiks.info/public/file/77657291267.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/84132215468.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/48931641101.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/79727859287.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/zozip.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/basipowokidawagesil.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021061721542078.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/maxodexile.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/53256702612.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/68019376126.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_off0000e458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6A 17456 bytes
SHA-256: 86f96799ab100992e7b70c056f2b4b61da5aa304e69c2a9921806cb05a2d57dd
font_02_sfnt_off0001296f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296F 10704 bytes
SHA-256: c49fae200179538a1f70542be952188a9e7c74ca0817058d7e4e8e3e16db2a89

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