Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8247f1841ea0a72…

MALICIOUS

PDF

78.5 KB Created: 2021-09-09 03:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1e39722015bfd33b69f3c8d93866e94a SHA-1: db3eb90f9039f576a845d53c787f3bfc91a46c7c SHA-256: c8247f1841ea0a729011ed97b7a2992d58da44c66ff8be70d5be26a994063f9f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains a heuristic indicating it's a password-protected archive lure, suggesting the user is prompted to download an archive and provided with a password. The document also contains numerous embedded URLs, many pointing to compromised CMS uploads, which are likely used to host malicious payloads. No scripts were extracted, but the overall pattern suggests a phishing or social engineering attack designed to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/02142adf586f37c1de6991f3547727e1/76665228766.pdf In PDF document text
    • http://cpk.by/ckfinder/userfiles/files/rumiji.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161375b0e819ff---vesabazujo.pdfIn PDF document text
    • https://angkagenap.com/contents/files/54757902578.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161376170d5815---75665268818.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/t5kn71irlen75jqsq2vvp9k7ud/zogogefogofed.pdfIn PDF document text
    • http://lecostationery.com/files/file/moluk.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/8703f8a628e37f95177e279ccef698d5/gegax.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/06faf7f3d853358e0e69c869c8c1f2c9/fejukidumowigopubet.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/59947394389.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131265b2b446---45586453189.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/nigilowanewupinivefa.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/sozovoropas.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/36611782929.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/sibiz.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/vanuniziridowolemabo.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/84237774370.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/xowepoxejatuxaju.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/sarobijuw.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/30942379409.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/milemolasabikajopevapiv.pdfIn PDF document text
    • http://djpress.pl/Image/files/61278166188.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/63337200303.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/88525518443.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=gta+vice+city+zip+file+for+androidPDF 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_off0000ce4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4E 10724 bytes
SHA-256: 230dd4ffd568d55ce7778b8be9e7dfab4123fc81d1e78694099b20e03a025d4a
font_01_sfnt_off0000e725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE725 17524 bytes
SHA-256: 23d2a857ca0944cc41b9ad2b01a02aa195d4f618228b0b619203785caab0a9de
font_02_sfnt_off00011401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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