Malicious PDF — malware analysis report

Static analysis result for SHA-256 a157d257fdf83091…

MALICIOUS

PDF

80.5 KB Created: 2021-09-01 10:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3e5a46db8a1a9caad6369393538d2ee9 SHA-1: a853436d8b8e274912db095b5062d4b027af329d SHA-256: a157d257fdf830915a3c7335fd0533cc50e8c065b6064e111e6cd83f8d25c1d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing attempts. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=net+ionic+equation+for+khp+and+naoh PDF link annotation
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ub1t788s0mls5vgkikufjb8qnl/wiwurozanuvuxuraferaki.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/dc82885d06e172a4ff7a1a8f38dc002f/46170211438.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/pajusenipivezaxalodome.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a22b6d01f69---malutumefavetepiver.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b33b200589---bebukagitu.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/sivarufojawemanot.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/tukd1vobtf1iocg1s8t4kckslq/vitotamij.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/73736218484.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/9caeb38da6325dbd89f3eb50876033b0/mefemesin.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/nuraxidusaxetepu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/304b6f868b06da6bfdcf60a894e3bbaf/21044434918.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/51967276415.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/774f0f239d369489efccd085d613a2df/37499037644.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/dunuwoxawotuluvixafosaw.pdfIn PDF document text
    • http://cauthinh.com/luutru/files/48699718340.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/kofixu.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mitipugadoniwi.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/rugagapizuvololutobax.pdfIn PDF document text
    • http://princeverma.in/uploads/files/merurasujevoj.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/wiwupup.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/40777413274.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/nolixipomodis.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/rpmqt0ufgjsbnqfc6p2daj4d93/sepusetagezeja.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/5aeff99d1a5219efad835d0c6e33aab7/14317242257.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096455f93234---6131135772.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_off0000d717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF29 17192 bytes
SHA-256: 1decdf73996d966e747fa61d3494227ab6dc26558b7e6e777592f137b54b96da
font_02_sfnt_off00011b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B89 10820 bytes
SHA-256: d38f0c9d2201e728a0abcdc608ff12fab07f11de8f370640076a13a9661b032e

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