Malicious PDF — malware analysis report

Static analysis result for SHA-256 09e1b43afe1219f5…

MALICIOUS

PDF

89.4 KB Created: 2021-08-16 10:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 64f24f4214bace0deabd2c8012c72656 SHA-1: 662320934f47f0c68a5cd96beb80a871a96e0306 SHA-256: 09e1b43afe1219f5d1d00558e5931faf6968364582beb3f539e442f048ff0271
156 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 high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress uploads and other disposable hosting. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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=sociology+a+down+to+earth+approach+13th+edition+apa+citation PDF link annotation
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071c8ff1abaa---39555003700.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210508015153.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/73064311148.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/839452121.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/6315906380.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/lazozanafutikobamifofene.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/76943949810fe51db67db8761e37190c/59487404212.pdfIn PDF document text
    • http://dymenahealthcare.com//upload/fckeditor/file/topape.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a41515343fa---kifipuvuli.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/kawojaxusetaguxe.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/kukuwigopifogusamugomev.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/43967360729.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/97af9b49590a578e6ea5596dc58ecb6a/puvajotukoxusados.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8048d5ea9---86413158967.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/70205043636.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/56953102761.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/palokupekuvivefarewegur.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16102f0e79f7b3---jilasudunekiduvi.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/f6d135ac324da39f1ca8a15bb68230d9/18886963795.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/5693874562.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/6623668712.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf51a9a8ca4---jigipas.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d0ff9be7e5653131bc3164ce0386d935/gutasewosizodobamusubexe.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_off0000f30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30C 18592 bytes
SHA-256: 4e715db524c1fa97db7285f0547b67c7154e052bb00935662a795935c5fb0742
font_01_sfnt_off000123ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE1 11124 bytes
SHA-256: f2e3fcc22f02b4ddac4e131177ed281ee93cd01902d2b45310c9a3b615744f9b