Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7555cba53d7ec2…

MALICIOUS

PDF

87.2 KB Created: 2021-07-01 15:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26915c8f4cc52e1414d061e4e1307237 SHA-1: b28b96ed781024bfc97d7d1dc0c89c715c4b23c4 SHA-256: 7c7555cba53d7ec2a59ad7b17909584041cc39771e8d0bd22ea3e703ac36c36a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a phishing or redirection attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ixtvs.de/_upload_bilder/_filemanager/file/kaborubig.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f81a04320---birurelivo.pdf
    • http://szrealty.net/uploadpic/2021-5/file/2021052003555273499.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec5cb51f88---vibonikewuramegutifiviwu.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/899e70787697712bb7aaa40a5335aebe/vizodireges.pdf
    • http://bogelaipigeon.com/upload/file/59838219423.pdf
    • http://thaoduocquyhiem.com/userfiles/image/file/mazavezuxazafilirudufaw.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb274803fd---5121468649.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/35h8ejd8e0qq69e1u64bv4t9d2/40727935264.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/8a0a9dcd4834d329a02ef800fbf8f7fd/ginexatetemajeme.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/r8k5nc6s3buip7v4r68npp72rf/jugiruxegewad.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a0956ee0943---lejax.pdf
    • http://www.alfapilates.pl/upload/file/49620071245.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/202c34090e8200cb4fcb42be33a30d00/ravedujat.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/14qiaj1gi836e9t4ik00s8nls5/sulomudam.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/xomat.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11dc2b1afe---vefomokakurugejazib.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c520eede5---melukadowiduvudex.pdf
    • http://czytamzezrozumieniem.pl/userfiles/file/30371649913.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/74ac8e5e3e0d574099724e6ba9473c0f/lijizirez.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/82c70c06a97ed29cbc20718ee59942f1/81498703274.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/64dddc387eca2a77f6dd4585ee33f891/53183025803.pdf
    • http://jshanwoo.com/ckfinder/userfiles/files/45437704250.pdf
    • http://phuvuongcorp.com/luutru/files/67298164604.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+install+cinema+hd+on+chromebook
    • 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_off0000ef6e.bin
652f9f493217edc80292f8a36f79cbb7bdf34365d231d29b2ec768edda83cd67
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6E 10944 bytes
font_01_sfnt_off0001089a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1089A 16792 bytes
font_02_sfnt_off000120ac.bin
80f83c2d47cea9a9b6d73074c0625019eb145ac301c9e5fcc718f52f157c91a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x120AC 17652 bytes