Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea87af3d1bf53ad…

MALICIOUS

PDF

77.4 KB Created: 2021-06-28 16:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7bfefb7f6bce1611b9b63458fec8f592 SHA-1: e30f7787a75865b0695dc0e0f348b7e2fd64774b SHA-256: cea87af3d1bf53ad780e7e1ff647cafed3f1120a81f4e057b6c37015ebc2e8ea
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external resources, potentially for phishing or malware delivery, aligning with the characteristics of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://sunnysidehigh65.com/clients/d/d0/d00d1ad1640c45b888f5e58ac216a5d1/File/56638830915.pdf
    • https://www.neosynapses.com/wp-content/plugins/super-forms/uploads/php/files/gfg4n0tcanv1d345ql1gk9jgoa/57513523766.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084774330f5b---41454575657.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079248d6433e---wumilotiza.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085526706b1d---dolutakamowopufazumetu.pdf
    • http://nedirajtebosnu.net/userfiles/file/53308700606.pdf
    • https://ludifrance.fr/userfiles/file/81899834323.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/8a929970854bcd60a0ea22bd7f14b145/tubitebibidefozoribi.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16094100595705---gusimivavu.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d1bc4522f---rozuzevefezenu.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806a3ba6d86---makusegefovuj.pdf
    • http://alhouti.com/userfiles/file/15052529258.pdf
    • http://www.bash.cl/media/file/46339640475.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/1968579007c8aa410d15a9ab6adbe5a0/zibirirumog.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fe39d72c6---vodagapedotomimivezuku.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/51f0e922d244df2af48e7841a0ee191e/fuwosaxevisudagod.pdf
    • http://vizit-k.net/uploads/editor/files/67548087069.pdf
    • http://fvv-hohenfelde.de/sites/default/files/files/36214879254.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/zasatunigomavumav.pdf
    • http://musorcentrum.hu/files/article/file/89966633598.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf58151ea75---fonojiv.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/qtj25vj7lp9n13mb2sldkspdou/wugeliku.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/252u77u88ihokei43ptg92gke0/guwax.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=free+hd+movies+and+tv+shows
    • 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_off0000cb15.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB15 16792 bytes
font_01_sfnt_off0000e32c.bin
58dfb81c9c9584d4b4faf1f0dfbba4980d33b8f8070243d3c326aa0a3d0b8448
pdf-font-stream PDF embedded font (sfnt) at offset 0xE32C 10596 bytes
font_02_sfnt_off0000fb41.bin
ffdf49986d63676fa451409b1b9861c4544c8f39f93819803d6c2b4948d01a80
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB41 16728 bytes