Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ddc4ea2f0360917…

MALICIOUS

PDF

87.6 KB Created: 2021-09-05 00:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9723798d798dc23237b6ba0f63b87c85 SHA-1: 8814bb2d962f5902500355ea4be0c521f17db7d2 SHA-256: 8ddc4ea2f0360917df80bcae4dcb9470a3cdc3a8af582a77246e05ade304650d
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests the primary purpose is to lead users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://securityguardsupply.com/php/uploads/file/82629526236.pdf
    • https://swalaya.in/userfiles/file/xidol.pdf
    • http://robertoantoniz.com/resources/original/file/52388372546.pdf
    • http://dexgerm.com/data/file/userfiles/files/luwevefoza.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817d96add45---tuzajuvoxozojamobu.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da1fd83d64---45642350668.pdf
    • https://elpollopaulino.com/cenavarra_userfiles/files/wurezamuli.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7236aa4e6---38466328982.pdf
    • http://schokoladenfontaene.de/idata/15881104214.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99be490a07---gasasab.pdf
    • https://naucharts.com/ckfinder/userfiles/files/15064813140.pdf
    • https://toppelletmachine.com/d/files/wupav.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a535fbd7426---6924867750.pdf
    • http://naso10.com/userData/board/file/goritemomozalugisilonex.pdf
    • http://podlahyadvere.sk/editor_uploads/system/files/39642909417.pdf
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/foresoji.pdf
    • https://mclandpin.com/calisma2/files/uploads/2154011470.pdf
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/1971542038.pdf
    • http://istanbulballoons.com/ckfinder/userfiles/files/pikal.pdf
    • http://smepil.com/ckeditor/userfiles/files/86550233656.pdf
    • http://holidayinntorino.com/userfiles/files/61026551906.pdf
    • http://vaness-sens.fr/ckfinder/userfiles/files/22571905303.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16094282aa55e6---bubawejubudipu.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ac00e6c4b73e97df11448409733cc4d3/paxotoretilariwafir.pdf
    • https://bike-accessories.supersites.gr/content/ckfinder/files/figufujeworerurelij.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=alternating+current+ncert+solutions+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f031.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 16792 bytes
font_01_sfnt_off00010848.bin
a3fc33569517be2ccb5aaa6e45544f752d38a02b15bc978a4fb4f48abd477e59
pdf-font-stream PDF embedded font (sfnt) at offset 0x10848 10876 bytes
font_02_sfnt_off0001215a.bin
e0097e6eaf9c652530e6eb263c7dc53e3910cd429b9efc02afdbad5be3b9bffc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1215A 18052 bytes