Malicious PDF — malware analysis report

Static analysis result for SHA-256 0537e58b202a1155…

MALICIOUS

PDF

82.7 KB Created: 2021-07-07 07:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 311a8210f9242e1b9fae291bf5e98c9c SHA-1: 0845c4730f2316d7d34518964e8f73a1e349905f SHA-256: 0537e58b202a11559b8db526474139d218b804fe75b0d41fb6cf1ff188ca4940
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external sites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to redirect users. The presence of a 'download button' heuristic further suggests a lure to download a payload. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=chemical+engineering+reviewer+free+download PDF link annotation
    • http://adabaskimerkezi.com/upload/file/33284403434.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/05drva01gqohovar1ad51iu6h2/velosipodebi.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6c94aaae0---verusatiruwutize.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/72562188383.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc62b7981d8---31385731966.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/l0t2k7q19mufvh0h98lo0hgiis/18529757651.pdfIn PDF document text
    • https://daiichigroup.net/uploads/news_file/45308517720.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacb7c4046---24964768727.pdfIn PDF document text
    • http://kaies.cn/upfiles/210602101835348229lgog4y.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608997aa2e377---madojozazakepojejixefi.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/20451430656.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160d59bd6e0a5c---wexewededexasararo.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/xadakuxinatuw.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e6ba1e34033235c9ac6c88a1f456b8a5/sifefuvefaxulavudu.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f22e4afdfe---nokinizadetivigela.pdfIn PDF document text
    • http://etre-belle.su/images/file/xijetitirir.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/d42137a9b04a86608cda81030c3c1f08/49266587744.pdfIn PDF document text
    • http://sepremprod.fr/www/images/mediamanager/wobereg.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/0387vubqv47kh7h65p6dpiotp7/votideki.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6b85725b3---36377740432.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/zikatoja.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1624625367874731603.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_off0000e171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE171 10840 bytes
SHA-256: f95951b0d0c3702cb16aab6d5c6b891f73baeadadbd6816cc3b1b648ca17ea3c
font_01_sfnt_off0000fa16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 16772 bytes
SHA-256: 1a3fcc4445ca25987ca16c29679a8788ca2b2615cfdd663eb091ffd4e7f5eaf7
font_02_sfnt_off0001255a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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