Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ef0fa335cebef4…

MALICIOUS

PDF

83.5 KB Created: 2021-07-09 04:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 5e48ad685652450e507a1bd739ef3e69 SHA-1: 0b33b00d56a8cc83f9b446ee0b55184885b5fa3a SHA-256: 28ef0fa335cebef40e9967f31f329bd868fc888df34aba6900489f2b71a7c4b8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many pointing to compromised WordPress sites, which likely serve as a link farm to redirect users to malicious content. The presence of these links suggests an attempt to lure users into downloading further malware or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/2jkst7j2rh044tlin16fus8kas/66029863101.pdf In PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074675c2052c---legofisokiparofefoxib.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/ac9b985f82382e22bbd70aa341375643/zebidivafuvefuxisu.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f67ca22bc---pironomasag.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/2rha6q9763517887klkf3vup0m/31361714230.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/22vm2l0bbb8af4hm1b0kr7kopt/wozosolo.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/94cu3frpcuaimkoppd3jpa9ht3/83301477186.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/55050992868.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c30c8f36c93---xovotixapur.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/luninadorinumaberabuzut.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/b9j0tpjobq0c16rli4r867pii5/pimulutadedisogolaboliw.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a02e9dcb202---22288385565.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/39724141959.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/zikubetil.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/javerowodezujivif.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/90387925211.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/dosebutav.pdfIn PDF document text
    • http://fullx.net/files/xorivagopidekeniwoso.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/4f4c5cf6c03894ab945b36f2af317ed7/regunetomusatom.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/e85f5bddf8d757aaae2598a606cfbcf3/gikivebimorazamem.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/zuval.pdfPDF link annotation
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=atrt+relapse+survival+ratePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 16444 bytes
SHA-256: 3818ef22130d51ae2e4eaeed8699225eac7f91268f901f234090c29b2fed6779
font_01_sfnt_off00011200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A17 10168 bytes
SHA-256: 077f25432c7512310071b65bbb43f5506d0fafb09fdf946f3126d0beafecc438

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