Malicious PDF — malware analysis report

Static analysis result for SHA-256 807a6350fc4a3b9b…

MALICIOUS

PDF

85.1 KB Created: 2021-09-12 05:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c04442732d6b6353d3f9933e63ff5c7a SHA-1: 25d715b32e3518a462ba6275b435460f7eab7dc0 SHA-256: 807a6350fc4a3b9b73352a2de41e75d8f88a2990a8b7046dea86c3ff1e9d2994
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains identified as compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and link farms indicates an attempt to lure users to external resources, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://spadhotel.com/basefile/spadhotelcom/files/libusop.pdf In PDF document text
    • https://jagamimpi.com/contents/files/kirovagevebobaz.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/60843973172.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/7899608913.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/nofuvevafidilakivatet.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/63346800264.pdfIn PDF document text
    • http://kechengchem.com/upload/files/juguvisolineke.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/14437604380.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///24167614560.pdfIn PDF document text
    • http://bptramptour.pl/files/file/wimiwodaxowumemim.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/livakemagakes.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/xagidoru.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/44465435579.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090516211572.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/kujunubumiwo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0a01b3242b45a57796b27d649bdbb0cd/78173171693.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f86408fb4---xozaparikini.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/29269213355.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/82955261123.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/ginosivapi.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/82745863393.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/ed6bb5209f98aea207de3913c22c4b11/38462208349.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/58129122798.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613587b0418e9---91623711915.pdfIn PDF document text
    • http://mobiliteit.nu/files/64451632390.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/73807510748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+cast+mobile+screen+on+smart+tvPDF 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_off0000e970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE970 17452 bytes
SHA-256: 0aba4317bfec3808cd27a9490983f3f2d090b9994742f52ccc47a921a0edc9b2
font_01_sfnt_off0001164c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164C 10672 bytes
SHA-256: 8ccef9cf9cd340adc8b6f258eaff2335da15a4127699e857119c09e19ba5d6a1
font_02_sfnt_off00012ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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