Malicious PDF — malware analysis report

Static analysis result for SHA-256 5815e10f03567def…

MALICIOUS

PDF

70.9 KB Created: 2021-09-30 20:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dac3c0380e0b611e8d4f1d4aa426b2dc SHA-1: 962e4af087e09c958e56b9185c5822952eecaf18 SHA-256: 5815e10f03567def990d706f6a370d23003197c4545684ad07007a692492eebf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations or disposable domains. The embedded URLs, such as 'https://crewmak.ru/uplcv?utm_term=swords+and+sandals+2+skills', are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crewmak.ru/uplcv?utm_term=swords+and+sandals+2+skills PDF link annotation
    • http://refah4ter.info/basefile/hotelrefah4terir/files/vexelopexukovivezegix.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/zanesedid.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137acebcebd7---pulusur.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16130a64c75289---mezogafagegedafomulat.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e57487f84a---27803811792.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/bejupug.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/bubeka.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/22063678621.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/73395226383.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/xubatozadeniwona.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/niwasusuge.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/93584916381.pdfIn PDF document text
    • http://prestopc.it/upload/file/dizevabubu.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/adf34e326df4d0cc22d53a2fa0375464/33190807776.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/9944445448.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/labuzago.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/33090380990.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/mituzavuseten.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/8165540578.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/99902143383.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/dagomi.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614049c0bf024---94463042806.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/xapexaxuso.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b8b98d48029ace142c261c8c83c02ab9/vobowosurejifosesibilob.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff60e1ff11---80864988773.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_off0000b419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB419 16536 bytes
SHA-256: c880b50013eb8d7b1ab3c7a3a36195224113a2a016d38304e2f483a22a1637ab
font_01_sfnt_off0000de75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68C 10384 bytes
SHA-256: d611a784401e852e94f1cb6d04d067fc01c6e798cf370a8ceddecb7e0baf0426

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