Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6995010016260e…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 17:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 99b3683575b43ee537a46ecaa32bcab8 SHA-1: 41694e49688b4af46e05c18303393d9b1d438528 SHA-256: de6995010016260ebae1f7ae3380ff0850fe2b0e17bf901f87a62d7a8308814e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content. The presence of embedded JavaScript, though not fully analyzed here, likely contributes to the malicious functionality by redirecting users or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://ablerexthailand.com/userfiles/files/58049173864.pdf In PDF document text
    • http://akkoryazilim.com/userfiles/file/lefakiz.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/xomebu.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/74049424024.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/dd2862b9f880153ce738e6e61986ccb9/nagukubegavemili.pdfIn PDF document text
    • https://ive-cal.it/file/wexoxoxaw.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/5c3a549e5e5ebf4b0bde584590ee8010/28967909000.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac54c910583---talasiginotubapigu.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/xujegolemopekageminafome.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4d4554948---domilefegopewijadivuler.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/79904061935.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210812_082250.pdfIn PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/27799502297.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/dca38f652c5c49dc1a21ca5e90eb94f2/40809151441.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/wuneremusiwibeg.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/jozesaxebodazadunidupif.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/mowufaxuxakuvedetoni.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/830743f420ec00d5d13596f6c15c53aa/58932856110.pdfIn PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/dedoxasilosabusijesoweso.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202108/file/1628495509.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb3dd84531---29830287046.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/noct573gmuuj0j1fcph8lffibd/20429787771.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/desubumo.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/bokaserokimi.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/farasufevufuritojenus.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a7b60665483bcc052ca93f6ada0ac7fb/4706499577.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/jurokijujeramabimokelovut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=good+morning+images+with+namePDF 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_off0000de4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4B 10776 bytes
SHA-256: 76aeebcad72360e9824c1f5a0ae62617475391473c9fba08ebe270dd481e1a16
font_01_sfnt_off0000f6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 17324 bytes
SHA-256: 76db96bd3a3fecfa39de2c11e5de77d14ad46526e9124d73b4f5f53c26f28b61
font_02_sfnt_off000123b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1