Malicious PDF — malware analysis report

Static analysis result for SHA-256 08afb98ec46ea8e7…

MALICIOUS

PDF

90.9 KB Created: 2021-08-13 13:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e6f789318f4f9dda2fc9baf49eeb7c73 SHA-1: 78f15b5428381453ecf70963691b7b1e68e967cd SHA-256: 08afb98ec46ea8e7cafba4493411135547e820253e3c26c284e1518991fe6573
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The file contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. These links likely serve to redirect users to malicious content or further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=la+biblia+del+liderazgo+maxwell+pdf PDF link annotation
    • http://cokhihoaiduc.com/uploads/files/86913331458.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/fd25755137e3ad139164604fa5f76d87/47218828925.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d8ed2d5ddc361fb19407b381be69da54/dipesiw.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/ba587f2248836930b23e2854e6c34319/lejulikusakuzawifosup.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/6626094277.pdfIn PDF document text
    • http://imaginove.eu/data/Files/21259881588.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/bf0847a904ad81e4f7a0d889a5f3b2ee/kuxekidafetunulupowilolu.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/rewifawosupegalenuxexoz.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/19904550334.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/efd351d6137c4f7d3f58e35e81cef8ba/68823582839.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210710181039_tuj821.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/18555727210.pdfIn PDF document text
    • https://summit-christian-academy.net/scauserfiles/files/ruwis.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/87b489324c3c3eb7e5da7130ccb38f90/nowoje.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/95945438832.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/c5fb6b4b83b4bc2e81a85f422876e5fd/ladewebewomujoxeluxakuk.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16077d27217094---nudodogawonaredok.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/68027940390.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/sejeze.pdfIn PDF document text
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/bagad.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/30771547195.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e821e06acd9---71578468445.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/tivisumusozelu.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/xemudukadejexapewili.pdfIn PDF document text
    • http://short-story.ru/upload/file/38246281004.pdfIn PDF document text
    • 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_off0000fb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB85 18364 bytes
SHA-256: 0a7ce591c09a109afc27c9324a5ba3afe4364f49d19ec3bfdf7d6996ec79b795
font_01_sfnt_off00012a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14254 10816 bytes
SHA-256: 9e0d898d8ecda7cf4973333f990436dfe56d054a34791d39eef2d4ec22578695

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