Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e6f7af4092781c…

MALICIOUS

PDF

80.0 KB Created: 2021-07-06 20:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cae103b25ac1c2b5bf24f307194ac093 SHA-1: c73bd596bbfb1fc9a57861e93bb0873255b89c3f SHA-256: 77e6f7af4092781c005a25118bb9d3ad190aea6e7f2add6c25cf6b127b0713c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to numerous compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and link farm heuristics indicates a clear intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://korean-school.hu/hangul/userfiles/file/wopubipixut.pdf In PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/dttduuaa0jl15qumm1ojhdsm2r/zezegevopoziwazufa.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/53779751470.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1f921f9b9---19443579966.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/std2lmnoit5p826oc3sj7uc0q2/bifegapapelorinamaxogat.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/86099139233.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/28805706807.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16090342130e00---livemajepozuvedovajigo.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2478cb202---86968928151.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/petosefo.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/dd020e8e819e7cf1f97ecf2d5f055ce2/25392817084.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/539b481d8b766fd81f6f580914ff9191/juzipewawipuvi.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0a9dd3e3f---85789095546.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f88ec4bfd---zurisetun.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/sunifoputevo.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/n477fl1g07m7arm977s8avus0q/39947767038.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/16829365162.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/djfbs1lvvqfnk2svp62c5m9sv2/78985562973.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e65a29ea1---88891601482.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/xejelapipitorufi.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/c70ab64db5ec0609a3cbc9f0ca248f5f/rilamamarajebem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=another+word+for+eradicatePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AC 10424 bytes
SHA-256: 04d1a05cbbb04a1e7d6e32dca6aa127258fa214e607d3f8e724dfca3bc09dd40
font_01_sfnt_off0000e954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE954 18836 bytes
SHA-256: 60a4b43d3499c8358ce832f350e3d6a1c73ea707b0891e983da6aac38d9bd650
font_02_sfnt_off00011ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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