Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c4ea2078d3d758…

MALICIOUS

PDF

124.0 KB Created: 2021-07-27 14:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: d3db9376c1317ab385cf9e4c9538ff24 SHA-1: 5b6360e212d789e950e36902c3b663b8ada0ead8 SHA-256: 20c4ea2078d3d7589889994037ed0053d6f2a7de53b8ff88960f8cb111de6397
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, aiming to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous links to potentially malicious PDFs suggests a downloader or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://parlagame.com/calisma2/files/uploads/21678159619.pdf In PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/aabd80798f773878050a3a29769da1dc/lolinol.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/sediviwodasalesetulegima.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/nebukideruwaleb.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadf94e10b1---butoloxekofowenekoteje.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/fenaxi.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5a16a440c---36201960070.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/56123498381.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/t7sgo30o4mvl2j7gqo17lg4hjt/suzavupajinirofararu.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/vimajum.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/1f37de3f4ba822890cff32ad9ac2db75/sujexufun.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16076f3497327b---2090395897.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/20283756823.pdfIn PDF document text
    • http://thepdaitruongphat.com/upload/ck/files/5358172447.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/91992318872.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16090185a4c318---47024991147.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/lebavajowikazezob.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/13928751476.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/49882308983.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/c92laj2sn8g0sj6s365ngl5uc2/88828990775.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/5d527eda15365ce5530872c6444c5cea/zabedisevugosizosexes.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/62972631308.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/fb2bba5ac3ec8f508f4a4c07eeaf1af4/fevoritojosoruza.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf96b388cf---gilozal.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16074d44ee2ab2---joreralaladop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=premam+malayalam+movie+in+tamil+dubbed+downloadPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001689a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1689A 21744 bytes
SHA-256: 25823ef6846ad3d465d7cd2f63bba86cceae882f5205fa09bcc3092074817469
font_00_sfnt_off00014fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FEA 10748 bytes
SHA-256: cf899632a81c6d6463d406eeda5a4d5ebbd4e5029711edba110efbc3deb5acd6
font_02_sfnt_off00018ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18ECF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001a6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6E1 23172 bytes
SHA-256: ce65507e341b1094df24fd6202ef920dcedf9bcfdb5891cc4962e053a3135795