Malicious PDF — malware analysis report

Static analysis result for SHA-256 47351e1059927ed9…

MALICIOUS

PDF

83.1 KB Created: 2021-06-29 15:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 90711f42d53e2e87ac10d5d9f621112a SHA-1: 3b4b44d85c4494a7668272c561ce61ed96644f5c SHA-256: 47351e1059927ed91175ff17ae268cc31b60e402bf9bd2aa6f6c30f78b95c49e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used for initial access and potentially command and control.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://bioident.pl/photos_fck/file/27077024474.pdf In PDF document text
    • http://samnakthodrahassob.com/userfiles/file/sonakizajagonilagu.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/oa9qkd236f5l42sn63mo8ia6i1/39738492319.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609bce268831a---xedebupigap.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c449b7c13d4---99980493503.pdfIn PDF document text
    • https://areicon.com/images/file/nilogeminelur.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/20729001679.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099daf92e2eb---12918996354.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/hlqbuer2kvohnkc4gq2v0mecji/92075188037.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59b8c65eef---17711356256.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/zozujolumuwedevi.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/c432526d96003f67beca71e6c9ad4572/35899778053.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c89dd36176---82267604895.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c940d3e1dcb---pafekevafikipilipobosif.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/retopadaweregabepibodu.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc2a61386d---sijijoradomipimas.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/misuvedujatu.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/85458794403.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/71214409222.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/67328fe6a7564232fc807679c86a0591/15736407980.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/fodowidepiruxojew.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/54292848216.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964fcab27e4---tejema.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/kewudubumegopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=compromise+agreement+formatPDF 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_off0000e1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C0 17392 bytes
SHA-256: f624f4a96fb1d68344d39eae0719863ef4cbeb1b011e14a3007da62d0d424d20
font_01_sfnt_off00010ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA7 10684 bytes
SHA-256: b34ba79a646d88878ccb0f32ad718bb6111a8f8830f95ac4e64b381ce6e94031
font_02_sfnt_off0001272c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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