Malicious PDF — malware analysis report

Static analysis result for SHA-256 7de7e1f18ed8eae9…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 00:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 679323ca91fb44fe95a778caab74032b SHA-1: 4c95fd43b3904e70d9beb409093885c77761c425 SHA-256: 7de7e1f18ed8eae9056cb67c7273fea47411e7abce1df59d9186f8165d842974
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to a mix of disposable hosting and compromised WordPress sites, suggesting a phishing or credential harvesting campaign. The heuristic firings related to PDF link farms and compromised CMS uploads further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://catamma.ru/uplcv?utm_term=use+office+365+account+to+log+into+windows+10 PDF link annotation
    • https://ducthai.vn/userfiles/file/32169555946.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/39872058536.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/kumewanonalomojux.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/pizuwovugokatanugitena.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/lugavu.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/19630189915.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/silupudejabikugugugafesi.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406be01c538---11064997364.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/lajasikupipodadik.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135cb5c6892e---66634840471.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/tozozorin.pdfIn PDF document text
    • http://ruresept.ru/files/file/ziroduzirujapagovubati.pdfIn PDF document text
    • http://innersolutions-uk.com/file/63263773357.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/mibakij.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139607b2d77c---66021768481.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/79937424620.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/39337447696.pdfIn PDF document text
    • http://soupworld.de/upload/file/rokaxejuwirirufovuga.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/79193301605.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/dezexorabevikixirevakomes.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/dipoputuxuwo.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/fiwunaxafirukiruxabe.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/sijuwopobuxevemij.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_off0000d395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD395 11392 bytes
SHA-256: c43b1cafeb89e482a8d4c4282a73ad204cffd398d0ad8382545efe174ba43a82
font_01_sfnt_off0000ee91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A3 17688 bytes
SHA-256: f020813e5483e00c76adfa84d72732ebcfced90c90936e641826c0d7652bd85e