Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd180a2dd35e24d4…

MALICIOUS

PDF

101.3 KB Created: 2021-08-01 05:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c193db002b71cb39ecb469132fa4439 SHA-1: ccda8b54438f846f56adda2a0e5c0129ab41346d SHA-256: cd180a2dd35e24d412d336e0b39d99c28c1fae399c86cad3750cffeb491b2220
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external, potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/58fbfc7469512fdb2e7f773540195f06/92371987604.pdf
    • https://shop-ecobati.com/medias/upload/files/wugetinifiwiveg.pdf
    • http://circolosilverblufitnessclub.eu/userfiles/files/15054048588.pdf
    • http://cleangroupbd.com/ck/upload/files/zezogifemisebilenuxezan.pdf
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/18869939668.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703585bb3c8---54115433551.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962ec665cc7---88686331368.pdf
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/21a08e54d554ba2ace7c004fd5262167/8893816333.pdf
    • http://benhvienlaptop.biz/userfiles/file/lutofofilozaginev.pdf
    • http://longarmacademy.net/fckeditor/userfiles/file/37725569178.pdf
    • http://raegcafe.com/uploads/files/soxenamegivu.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a422c1d8fe9---21479217875.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/d77ff957a3e87f4ea5b441ca8498ffe5/91868445533.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f091aab812b---ketekemonudafitosopanab.pdf
    • http://cartopack.com/Images/file/vemugup.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/ffd3b4a61bbe2c5bdac98a7054cc761c/77844579365.pdf
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/lazowagopoboxukijajavubim.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb5fa9ff9c---midukideloxojemu.pdf
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/80533736693.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/tg25bvecvg9rvvtp4328h7lbee/nezajam.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=who+is+art+spiegelman
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001281d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1281D 16792 bytes
font_01_sfnt_off0001402f.bin
7c4c16c1d217a189a240274d3faef0e3121f5532cc0f6fa8fe4533d50c6166e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1402F 18260 bytes
font_02_sfnt_off00016fcd.bin
f19d7bf7cb575388ca45f22e47b2111dafaef177e7a195fac766a175bc8f34ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x16FCD 10692 bytes