Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5685947a285413…

MALICIOUS

PDF

91.3 KB Created: 2021-07-23 00:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2b806d45b8e9c7fa977486d8858087f0 SHA-1: 57c83618f3c5f250586da6bbc105a0c5659dcab3 SHA-256: 8f5685947a28541332b1103aa968b1435b0505b029cf274c16499f75dad984a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings clearly describe a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://suacuacuonthanhhoa.com/upload/files/75249006275.pdf In PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e17590811---7238895477.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/38633598220.pdfIn PDF document text
    • https://lecapsuledigian.it/file/vobakapesikiziguziguxi.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894b4793ff4---jidukuzigidejuzar.pdfIn PDF document text
    • https://ksboutlet.com/file/files/jitesupaxik.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/r4o7ivp6nnucc0m1v9q0007oe0/56131350368.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/kesuwizofugofijiguf.pdfIn PDF document text
    • http://sherylrobphotos.com/clients/56056/File/24318155299.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887d080f0c4---73574439827.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081542c9559b---15265197813.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/patiru.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/bodaporalinujer.pdfIn PDF document text
    • http://richwoods1969.com/clients/861079/File/nobugimajiwugasilosodako.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963c662d733---senufomazuxezuvorodax.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a20a87c13---71247686969.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607157a79e632---jawenagugudibajerewije.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/tazare.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/76802117454.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0290f4dba2---ginunatizopusufigezobob.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/zexuzezuvuxafef.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/12244668682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=proving+line+parallelPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFD 10228 bytes
SHA-256: e6b446b7d710bbb437c470eade8c0685abddafc1bdeb24a0c6cd8c4865c631cb
font_01_sfnt_off00010303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10303 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_02_sfnt_off00011834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11834 17580 bytes
SHA-256: 3aa3f2c1ae35113707fa88a3b7deb92d2c0f006fb9f6556ffd9ba56a596f9f48
font_03_sfnt_off00014715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14715 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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