Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea63e7b8cd1b93c2…

MALICIOUS

PDF

83.8 KB Created: 2021-09-13 16:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 37340daa431a31b1e45747cf85957f69 SHA-1: 0073c141102871f316cde5e08f19efe2d9c9cec0 SHA-256: ea63e7b8cd1b93c276c5b900fa6e8fce6600b217772c94c12bfbdff35c9b9460
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=expecting+better+emily+oster+free+pdf PDF link annotation
    • http://budoprojekt.eu/obrazy/file/wamekarejalu.pdfIn PDF document text
    • http://pinxedien.net/upload/files/77946532160.pdfIn PDF document text
    • https://educhina.mn/editor/files/86455278583.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/tuzamej.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/pomawivobo.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/pemama.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161305102c0a4c---dibavesaxosakigu.pdfIn PDF document text
    • https://derfo.info/resimler/files/kifamafezuvigi.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/32559927288.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/bamifutimo.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210906172042.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/rapuvugupuz.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/wupigawivebisobifur.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/3148595472.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/6k5lr4nou4ovn8kmd81ng8crvn/vuwekox.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e3068aad3---27889541491.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/90297670464.pdfIn PDF document text
    • http://actinq.nl/upload/file/bomutet.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/dujibekujekufo.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/26071012396.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/nilegetezogigejujelaxo.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/a71b2ec0dde29743d9cec45d387aac09/89205993080.pdfIn PDF document text
    • http://air-con.ru/upload/files/jixuteredeb.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_off0000df46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF46 11140 bytes
SHA-256: ec8f3942aef479a9f2b74376299f6e6140005c8b9913781b9f27d04922645baa
font_01_sfnt_off0000f8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DE 18816 bytes
SHA-256: c4bdd167164bc6f3d561d49cc2e76e0d51023f6a214dfe72dd5f1bee09503d40
font_02_sfnt_off0001293b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1