Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea8965fc451d026f…

MALICIOUS

PDF

70.2 KB Created: 2021-09-27 20:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 85bb5540985a8edc10c4b86f82358b7e SHA-1: c9fc10b6807f9daf5244138b9011a118aa7fce98 SHA-256: ea8965fc451d026f247845a90c815a83666c2cfbfa46a9e647b70dae8d2fc54e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm used for phishing or malware distribution. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://diegogenna.it/userfiles/files/ziropisuzotefu.pdf
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/1907772944.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133c508e913e---24716039905.pdf
    • http://unstitchedfootwear.net/files/file/xedamapobomewijeju.pdf
    • http://patrick-vallot.com/upload/files/naxet.pdf
    • https://gulfb2b.com/userfiles/file/xeron.pdf
    • http://mkbeauty.vn/luutru/files/28731806155.pdf
    • http://cyc.cz/pictures/clanky/files/zevotovekel.pdf
    • http://dok-vo.ru/userfiles/file/19172053224.pdf
    • http://abwessex.com/uploads/files/tirugavuximizupunofap.pdf
    • https://sofanet.ro/ckfinder/userfiles/files/lebaje.pdf
    • http://pinxedien.net/upload/files/jesavagenimanazosimoxal.pdf
    • https://onhimalayas.com/ckfinder/userfiles/files/37038710212.pdf
    • https://citronel.com/userfiles/files/55784249177.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161516279ba0e2---junas.pdf
    • http://briquettemachinery.com/d/files/lujarataxesafirum.pdf
    • http://sdes.in/uploads/7220272211.pdf
    • http://ltptech.vn/uploads/userfiles/file/wexibutesoterotuke.pdf
    • https://mimpidia2.com/contents/files/kamenugekuxewepeni.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/83cd0573e2bb12bc2eb364309bfbc439/81159034475.pdf
    • https://10fci.org/userfiles/file/3187206457.pdf
    • http://drzwiukryte.pl/userfiles/file/wiluzelito.pdf
    • http://ebrinteractive.com/userfiles/file/17196741191.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161385caba71b0---fasumalem.pdf
    • http://magic-mugs-factory.com/uploadfile/files/molanafolejefiwebemeliw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=advanced+engineering+mathematics+rk+jain+pdf+free+download
    • 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_off0000b187.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB187 16792 bytes
font_01_sfnt_off0000c999.bin
5b73d7ab018db8a58392a318c4926fbc2b4b09bc65655cee209f2ed83c140ee8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC999 15160 bytes
font_02_sfnt_off0000f00c.bin
b0d87b067a4a9c4c1c95dfb4c8d06daa7f54471fd5d07ca65cf771766660f416
pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 11420 bytes