Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f53dd23af8d6672…

MALICIOUS

PDF

93.4 KB Created: 2021-07-15 20:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: aabbfae173a2b71c5aa3fe868c0be179 SHA-1: d9572b27b192c265971539447f5c89e6138befcd SHA-256: 9f53dd23af8d66727b1e24545b8e140834962944034fed68d52e2ec83d59db6e
196 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and a machine learning classifier. It contains a link farm hosted on compromised WordPress sites, likely intended to lure users into downloading further malicious content. The 'SE_CLICKFIX' heuristic indicates the document may also contain instructions to bypass macro restrictions by tricking the user into running commands directly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b112f790c50---93912212055.pdf In PDF document text
    • https://latework.cz/soubory/niferugeguxoresuwujepo.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/fosududilaxibegiker.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160984fe9bbb6a---kidoruxedegelaz.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/jalanoxozega.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c0d73cc3f---wulebolawebi.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/50277227144.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/wajekukubaduge.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b702fcabd4---nemuzedanoni.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bfe48e1a0---7131754768.pdfIn PDF document text
    • http://abnicum.com/files/file/kalilumuxexegudav.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa00d05ccc---tipomegibasuzotevu.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/xupitodivijir.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2399049596---kividolawosebokolal.pdfIn PDF document text
    • http://standardamulet.com/files/files/dubegeteloxig.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/rujiwirosek.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0c572243d---lilabesapifirawemibi.pdfIn PDF document text
    • http://akademibt.com/resimler/files/79025094902.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b198a9813b---ginupu.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/rit91qjnrss19rprn0dcjdfbpq/75841050747.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f52c349f6---wivolutobisexexidovasoge.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/45454dd6eb883ce267bbfb355bb885b7/25603769396.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34f7a03e4f---19065336683.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/fajodejuwujegegubuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=special+letters+keyboardPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF165 10824 bytes
SHA-256: de0c7b253b9b3c0ca9b3e82e2056a87fec69e9c8df48ccb007dccfcdf61a11ff
font_01_sfnt_off00010a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A41 18364 bytes
SHA-256: 53e3c72377386264d9ba36945736a3ee3b1d0d0c4aefee496a1ce57dc6947482
font_02_sfnt_off000139ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15210 16268 bytes
SHA-256: b386d9056a900824ec2c762c9a86b28d0f37cc36a5ea339cdc2f9d7a1723a461

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