Malicious PDF — malware analysis report

Static analysis result for SHA-256 a566df2680a9795c…

MALICIOUS

PDF

86.5 KB Created: 2021-07-29 23:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d6308923d65ff8c23a26ccff92c15df8 SHA-1: fb80598739c619645b1342699eaeb37e4b0a123b SHA-256: a566df2680a9795c44ce88e11f72f2ab48cab87175a3b52948be1cc56e154813
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a PDF link farm. Multiple heuristics indicate the PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, likely serving as a distribution point for further malicious content. The ML classifier's high output score and the ClamAV detection strongly suggest a phishing or malware delivery intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee1ab4dea2---mosopulirusabowibasu.pdf In PDF document text
    • http://files.ibiza-ferien.de/file/80534064226.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/3edda9ab91c23cbeb6a160a3685c9bdc/xiveworokojereruxavilu.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e7c7632c9---33118956291.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099baecce1d4---66660246300.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/nebaxisedegukavuvojitu.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16087a02bbe152---75890427605.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f98f6c5274---fibukazose.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af347884134---jajeteronefamumigevepizoz.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867386b05cc---jusowuva.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/novujifawejunitovum.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e3c6fbc4fe0---78332587859.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/43799742406.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/65655254003.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210629/file/16249242619780.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/webowefuwoxubumelorev.pdfIn PDF document text
    • http://gtshotel.it/images/file/77222039642.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/vesoxopabixut.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1f3e92cb0---9851597599.pdfIn PDF document text
    • https://emprenderem.cl/files/22840722978.pdfIn PDF document text
    • https://autopratichesas.it/file/sujibowobojelopogif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ammo+49+dl+answersPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 17168 bytes
SHA-256: 235801328e46376ad34328b728660f7d9525870df9e72b1ed2a88eb950040d9e
font_01_sfnt_off00011b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001334f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334F 10532 bytes
SHA-256: c7dabfd928a85fa8ea3ca6ff141bc28724078e1cd9ea201758cf1b1cace71131

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