Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf88d5599592ae2…

MALICIOUS

PDF

83.3 KB Created: 2021-09-23 14:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c057ec0c1af2ee5df4b9a8ae2c10779f SHA-1: 4a1c4b0fe9119abaabbd75470a4472bc5bbaf8c4 SHA-256: cbf88d5599592ae240bfc9d70d8d95abb3682c0ec91ceeb534b25f18190a5730
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised or disposable domains. The presence of 'utm_term=cain+and+abel+apk+download+for+android' in one URL suggests a potential lure for users searching for specific software, possibly leading to phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://cnn-logistics.com/asset/files/59218962090.pdf In PDF document text
    • http://aucoindeshalles.com/menu/file/xavij.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/31838603.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/97265814488.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/jowafutabusijoxefeb.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/dakigojevowuxupulugowanuz.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/gajarobuzona.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/xinadetunowijavesabida.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/51140881336.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///nemimaramosolexavigerupeg.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/wosowiwasugamododagor.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62004636710.pdfIn PDF document text
    • https://rozynoklinika.lt/userfiles/file/rubanomegijevasojalot.pdfIn PDF document text
    • https://satesayap.com/contents/files/14468683744.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/voruri.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/nobejakowabuwivinukibo.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/kejomepor.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/54225732907.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133f3697aa6f---77282549084.pdfIn PDF document text
    • http://esejsc.com/upload/files/remibapogafudaroxigugiwed.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6edc3d42c---xijatose.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140913b6fd8b---vidixekakanunekenosola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=cain+and+abel+apk+download+for+androidPDF 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_off0000e05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05F 18420 bytes
SHA-256: e8b65ac81ee064872857b82ba54eb6b2637c89adf435ea15cd0d6230b02e643c
font_01_sfnt_off00010fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDF 10576 bytes
SHA-256: fd61a691671bb0ba07a3acefdfc11e369dd161733929abdd36b6fa9e4dea8086
font_02_sfnt_off000127e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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