Malicious PDF — malware analysis report

Static analysis result for SHA-256 567d15fce04e6da4…

MALICIOUS

PDF

86.8 KB Created: 2021-09-01 09:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6094d4530a1fe73b9a90b1b2e1b681d3 SHA-1: 9740d314193c61a44de676778ac89a22594e5c67 SHA-256: 567d15fce04e6da4f5c908f4d48e68348c92901b3c00ba6f3c483e61e2e9a385
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://smidgel.ru/uplcv?utm_term=prayer+for+patience PDF link annotation
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/9be2b21167240598f39f101df352e046/74282170523.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/nuwejakujaregusofaxamabe.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082290c879d4---fudidute.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/k3fai2tk36bqjkjqcmuhrfbmq0/merosixifivugapese.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/zomirekinigu.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210725_81B08BF9B1F6B381.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/rularaxunaru.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/74835549276.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160797171c58ee---15075264802.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/gsg7h8uiujgq94tfmm7umq3rjt/wikubobefog.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/xelomidiwogifi.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/18788242196.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/lelonizitewezifidiro.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612b19ea3165a---77540781122.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761d0b7ac48---75999249822.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/edmgrh48pmdmjcddnlc2p7afna/84368967688.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/45654271820.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cdc61416b---5669454405.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/luxuminefazidekoremoxid.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/73850301111.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/55534124227.pdfIn PDF document text
    • https://petala.gr/userfiles/file/96965294305.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4ec098f78c4794df19da2335a5c1137c/sokoropazenix.pdfIn PDF document text
    • http://vanhoadautu.vn/static/uploads/editor/files/porarokebuxozugun.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/nidurudotipat.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210810_181433.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84309bcf60---91415528993.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_off0000ee06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE06 10376 bytes
SHA-256: aef73073ab0631d277e31deccf1f172e8b537d228d912537660781a60479562e
font_01_sfnt_off0001059f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059F 18540 bytes
SHA-256: f48e47191e8d8b660b35749d066220e26f5041ca2b3af634daad4bb7339bb150
font_02_sfnt_off0001360b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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