Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ddb83361e776ad0…

MALICIOUS

PDF

88.7 KB Created: 2021-07-21 14:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e9383429423ff94aff9c6eafdfeb143a SHA-1: 7ebbd01d9c971ff7faf8369be6b671e31cb75c68 SHA-256: 7ddb83361e776ad0f88432849dc7eea206a9edc2ff7540a5a049add2ca6cd424
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as link farms on disposable or potentially compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests the PDF is designed to lure users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://verynailscm.com/user_img/file/68476675914.pdf In PDF document text
    • http://goldenpeak.it/userfiles/files/77419385769.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/2084387c4768767cf779876b46e6a2b3/23930607519.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/begutirazudusumirisegajus.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210720_041242.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/63283719855.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/23488935975.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/bawasilug.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/31750787140.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/21285926515.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f63c627f8---70641315072.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/uhmdq29me01v59gog7ic6i4ns2/novutonotewaso.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0318ab4b5---datuzerikezezikexoxiganon.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608590dcaca16---xalikamazubagujerifaz.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/bixovozidigalewenizejak.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f3e6ae64d---39504711036.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/ririkukodog.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/4e0beefe2cac9d402b6fc3cc868219da/12980680830.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e32c4b9d0d---71162335158.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/lejujokes.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608655ef213ad---fedutolaloteja.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b41fd774b---nigogileb.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/88068888295.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/dukalusa.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da5a06bad62---63853657816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+relative+permeability+of+ferromagnetic+material+isPDF 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_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 11208 bytes
SHA-256: 93d8c1ba83e048176488a30fa519a21787892400ae96979cb79dbd46d23cc4a5
font_01_sfnt_off00010dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD3 18508 bytes
SHA-256: ae74f4e7b37d4d9aaefd7def0d9ede60aba29b6c39dc82b8695812db932abc14
font_02_sfnt_off00013d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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