Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a50cf7a4112aa1…

MALICIOUS

PDF

85.1 KB Created: 2021-06-28 19:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 71fe47184f0c3f9ac901c92be4caa926 SHA-1: 0d9e1306105201bcca8d17ad9daa83a8cbe534c9 SHA-256: b2a50cf7a4112aa1b86f324d41d3d6d58fe7401214dbed0ff26368abcdc71fdd
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of UTM parameters in some URLs suggest an attempt to obscure the true destination and track campaign effectiveness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/tfb7048p5u1rotguadbrjv8ou6/96040935637.pdf In PDF document text
    • http://christopherdallo.com/file/jazapizowixatavusutijalim.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/30675617628.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/baroxikuzid.pdfIn PDF document text
    • http://plncse.hu/php_data/file/nulasosijoxole.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/07bfd1d69eca8a75aea67dec1860e4b8/poweziwamafafotusi.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/63112430222.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/xijemulipo.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609a96995e50f---25689506695.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b41d2c7c8ad---kezemanig.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd068e39737---tanamabikokaz.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/9223668394.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55981bb821---66510278137.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/b03b32706e9b24861d712f36f0be0b90/26410643230.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/fofj66v7f8gqonp2tpm4ejdgmv/worilofif.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/48576360318.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607250a735ddc---6075696987.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef42a49a5a---zegelipumunurif.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/tmusl1d4oc7q2msjofscr0k222/kulilutimekemififoboni.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759204a4bc2---nabakuxogopurovadazovagi.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c37c1a5a25a---1982451018.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/4564d14e17340e2c9afe28b28ebceb8f/motiwuximu.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/vamikujug.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/6a137bb41d0b79a842831426be511434/73329817733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=avee+templates+free+downloadPDF 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_off0000eb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB49 10700 bytes
SHA-256: d9d0c3e96ca80f56c25715a363d8d0394eb55f8b200355345c89894618dccb39
font_01_sfnt_off000103ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EA 16128 bytes
SHA-256: 9eabed2a54c93fe32c4353b888ae3a355fc7672f1b5df87b718156309ace8149
font_02_sfnt_off00012d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1