Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5bc604338577273…

MALICIOUS

PDF

86.2 KB Created: 2021-09-15 17:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b036afd328b35903062bb36b9d1d977 SHA-1: 42f96b2ba8768a6153fee135002ae9c3bbf9954a SHA-256: c5bc604338577273be4333c6ae3d86a06f398952b9dd60317fff992e88c97593
164 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a 'download button' heuristic and numerous embedded URLs, some pointing to compromised CMS uploads and disposable hosting, suggests a lure to download further malware or engage in SEO poisoning. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly imply an attempt to exploit vulnerabilities or trick the user into executing a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://kmjmt.com/news/upload/file/210901083824436809n7ri4g.pdf In PDF document text
    • https://hbphoto.ca/resimler/files/lekepepogavuf.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/dabigabijefuvibuletemine.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/56di8ic5gdd2te8aqq6oddgimk/58533187187.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/segoburegumosajibuko.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/85845918311.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/6249779005.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/fininalafumixuzinewadu.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/37117388514.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/17560639175.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/29147921824.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/bo0revhaeq063uh18929ndfvb2/35087364215.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/nujasage.pdfIn PDF document text
    • http://epicridesnepal.com/files/98520950960.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c8219a567---deloraropaxeninijag.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/42710340885.pdfIn PDF document text
    • http://chpcentre.com/files/file/xifaxonipulidapazapiwezet.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/45610323988.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f42d818d53---44726429122.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/e845fb29cbf15019d79a5d8b9867be97/2946341050.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/29473362888.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/44123774393.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/lifukafajaxoranexu.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/betipolosibetaj.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/kodowusajunudid.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/64p0c63dsmks5jk12rasv00p35/55891803559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=crack+office+2013PDF 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_off0000eceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEB 17760 bytes
SHA-256: 5742394942cc32a1372d0571ed749abeb2d0a4f15113b66840421c3bac5188b3
font_01_sfnt_off00011ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD8 10500 bytes
SHA-256: 34fb6068c3fa3a99d161d81a4ceb3367ab4d05cfa0a9ea1675e82d30353def50
font_02_sfnt_off00013301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13301 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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