Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2ba10b858baaf6…

MALICIOUS

PDF

80.2 KB Created: 2021-09-01 22:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3482453f7dbb48311274795578103027 SHA-1: 7407012077f816881d05ff151a622ae9685fe6ed SHA-256: 1b2ba10b858baaf67dcaac5e2684381e9d082dfa67dba091a5040e4cf03e365d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=new+odia+movie+song+2019+mp3+download PDF link annotation
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/c82b1004853d0ec6be25f008ca058e68/givewerulifalobujiji.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/wexinepokovanewiribezex.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/73974526196.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/wifawetalixovagamejok.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/9cf5b86cda7c15ae46ca9d593653ccd0/11891050845.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161157b78b8b44---72732001500.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/nugevono.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/14344647037.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/2021827928172429.pdfIn PDF document text
    • http://aven.su/userfiles/file/65318280915.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607129707eb91---21455670372.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210808210404_1955715026.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff507191c4---96872249772.pdfIn PDF document text
    • https://cheesykeju.com/contents//files/nokutofikititu.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ab4d17440---natemunog.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210607154713.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/7mhk83i8qaljqq0nkmsafesd0f/41242922255.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/dizerolazamowugulewevudi.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/mevufejijowuviso.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/f22210a98c84726a77143fa6203175ca/32377212382.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/36120761046.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47435063703.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-8/file/9431126891.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/jotav13eatra4616qcaejf9jpl/femajejedulubovig.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_off0000d351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD351 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB63 16908 bytes
SHA-256: 0fde49f3bdfc5ed04b3820965458c5b784077e2e84c58a0c82136082f99baf7c
font_02_sfnt_off00011762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11762 11300 bytes
SHA-256: 36c3ba1fd63c892deadca6901968451e9dbb296fe64fc62162ff5d526ec22e5e

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