Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1379f402906fad…

MALICIOUS

PDF

81.5 KB Created: 2021-08-12 12:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d11cbafeb0dbbe77e0aae9294333476a SHA-1: 6d62baff34e29ec54d5a53fc3efb13c5a7306d1f SHA-256: 8a1379f402906fad9f5b9cc84f41096ef812129eff89175c416d6e917c90a0a4
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest an attempt to manipulate search engine rankings or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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://egyseg.eu/ckfinder/userfiles/files/lematoxera.pdf In PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/1m4a5hccpinu7d7uqu6tl7vapt/nuregukaxosuduma.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/72539386419.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4896689db3---29036725292.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d4839cd117f4e36edd5d01f85b03edd9/23739803494.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/23780490616.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097de813233d---kinaxok.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd59a4784---wajomi.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/jabijaditi.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/vetivaxoburusoxif.pdfIn PDF document text
    • https://majubesar.org/contents//files/43766867586.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/xevoroditukizikalejubafal.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160820703a42ca---jidesapewubazoniveri.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8f07be64fbea994f61ba332c3808a6ee/posorifofetunesoku.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac757da0dc---jogejijo.pdfIn PDF document text
    • http://skisun.it/userfiles/files/ketidipivaxowixa.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/avvkf5j8g48grv0297d971e4g5/23050642627.pdfIn PDF document text
    • https://krone-murten.ch/userfiles/files/babegosu.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161044dfbbdcd5---78110194446.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805de236c3b---kusafodovunovowupuna.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaf386721b---89740063460.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e72b0e462---57396318717.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/webefenonubowememukukared.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+select+duplicates+in+google+sheetsPDF 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_off0000da86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA86 10872 bytes
SHA-256: 523a696bd9e888382bd378f0620394e725c0696191e3c8e51afeccf7a0c74892
font_01_sfnt_off0000f35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 16620 bytes
SHA-256: 118e50c37283fceb61cc18876d0ce6b8da950f494d018671988cba5c90a4f53c
font_02_sfnt_off00011edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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