Malicious PDF — malware analysis report

Static analysis result for SHA-256 869fe681ef51420e…

MALICIOUS

PDF

77.8 KB Created: 2021-09-04 02:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 91c9ce134a9d692e2e7ec7e3c08d29f3 SHA-1: cd456b5cc5d06dba10ac66448db33948c9df02c7 SHA-256: 869fe681ef51420e0107f5c313aec4930dfd72bea2a83fa0a589ba847997a1f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, indicating it likely serves as a phishing or malware distribution lure. The presence of numerous links pointing to compromised websites and disposable hosting suggests a link farm designed to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and link farm heuristics strongly suggest an attempt to exploit users through deceptive links, likely leading to a secondary payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://starinviter.com/ckimagefiles/sidifijokekoraxudij.pdf In PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/52735498415.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a058f45de871f23dbba9c1d96e73829a/37605515071.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/lupulopotewajivefuw.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/68c887b80684fab07ea4165cec837e6b/jusipiluk.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/2650634117.pdfIn PDF document text
    • http://penney1970.com/clients/7/74/747debde904cce1d9d58e62e9103e361/File/53155835188.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210831130406.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/zopifu.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/palawuravujufakalema.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2ab926a1ae07841ae89be1ca76e1c572/timomeritubezopineba.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/vuradazorad.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/42460173960.pdfIn PDF document text
    • http://artside.org/data/temp/file/1163487673.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/tipolezali.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/5532438f1bb4ad17c4694e662e318a59/pamelesivavej.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/075nh3b0fu0mlqv1bemubqaqq0/wijajifopuberudipavug.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58245328377.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ntrqun1b3rr0ma96pob6t4dqo7/piretenomikafagoxudugo.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/22762670613.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec24b0eee2---sovujekerutuvafusate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=latest+urdu+novels+download+pdfPDF 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_off0000c58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58E 10608 bytes
SHA-256: d33b68d21e33ba978f982881abcc37ae60ae7e0fddc5876c5fd17b2629cf881e
font_01_sfnt_off0000de04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF616 20052 bytes
SHA-256: 6670015b463d553a93879aead97364375edcf95d50d51e387ba1f08f20e77778

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