Malicious PDF — malware analysis report

Static analysis result for SHA-256 574df4ba1137d128…

MALICIOUS

PDF

79.5 KB Created: 2021-09-05 21:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 50283f6b9129d22562dd079ffcef8ff3 SHA-1: 5f51d5bf76b98b10f36a7614bc8a0bb4af985e53 SHA-256: 574df4ba1137d1286cecbe3fb255c285fe5e08415061b429ce2b4d85e0e37fbf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to lure users to external sites, potentially for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://crewmak.ru/uplcv?utm_term=deutz+tractor+parts+manual PDF link annotation
    • http://shethof.ch/cgi-bin/dynamisch/file/64469553723.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607522d1b0886---pifeluporobo.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/lenaperejezatogowowixaf.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/64912710580.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/jilosivowiwunubozof.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/sawerivigubinedikijiniku.pdfIn PDF document text
    • https://eurotig.ro/file/97749328843.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/62869828413.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/zuzakilo.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/e27cf3603b913bb9605ba95ec007a8b5/93108546841.pdfIn PDF document text
    • http://elai.kz/upload/2021/08files/2108271957060201824tkwr.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/62889636657.pdfIn PDF document text
    • http://stylekd.ru/files/49671977864.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210629231821.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210610143433_e8rwae.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/jozulilupepo.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/a0d0eebc4ba5190a7f09d2a12175f6a4/98623244908.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/dopezuzaverokezudenuri.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/zemabolepe.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/pawotaziwa.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160c286fd16e42---nuzewiwexuji.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021081219203570554.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/sajariwoxirebuferipogam.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/42018491570.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9553479a76---35999990513.pdfIn PDF document text
    • https://dintek.eu/uploads/file/mebivakadabikewosojodagav.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/34065737196.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/dejeritovaxere.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_off0000d266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD266 10604 bytes
SHA-256: 5ce48a34531398de633391aeb2531c40fecf6468345426c925cf769a17f4efab
font_01_sfnt_off0000eab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB3 17612 bytes
SHA-256: cfcc399d356a2721bc08da2fad9d50b1e7f7a7a2028e22061e45bcf337994efb
font_02_sfnt_off000117ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1