Malicious PDF — malware analysis report

Static analysis result for SHA-256 24aa3653bc11c64c…

MALICIOUS

PDF

92.2 KB Created: 2021-06-26 21:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87362786ebe34f48d97c1bd90e0b67dd SHA-1: a9d32f203cbe0c318b3b095f64acbe089672ee88 SHA-256: 24aa3653bc11c64ce0ab4f466a601a100041c62a99af52804640bc15955ff3f9
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF files hosted on compromised WordPress sites suggests an attempt to distribute further malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://aelma.com/sites/default/userfiles/file/mekas.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97dad762c0---varatogu.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abc103dd20a---46385768048.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/ugt7l2c7704ek5orn5havhhjka/19530056661.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/edeb14685832532409ed5597f659a9cc/menisopodofujusometo.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/e31fa7ef6188e4dd35263553c98e0874/85299998346.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160bbea89a1c90---26947840859.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/erk0kbftsu403o2dmj239fssit/davekosewuxiv.pdf
    • https://twr1115.net/files/fckeditor/file/18286215884.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dd2824017---mafejigekanupimugepozod.pdf
    • http://abwessex.com/uploads/files/daxozebupiwemikovumo.pdf
    • https://ctsgroups.asia/images/file/tijopevukazugedatokokapew.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b2108e61f---dogutesikanodosidutedut.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/96249875847.pdf
    • https://turkihale.com/userfiles/file/botagozivetixim.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca02dd7978---wijibosepasebuwirizuve.pdf
    • http://jejuecotech.com/ckupload/files/gutelasinajikozo.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606ea0f7d51e3---gepelarad.pdf
    • https://cavalier-hundezucht.ch/userfiles/file/95797111015.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160874d0167bcf---99913333709.pdf
    • http://wisdomtours.net/upload/file/99308661967.pdf
    • http://ozdoby-betonowe21.pl/Upload/file/84718640641.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b2d424231---kubitijipezelogavewupuwev.pdf
    • http://astro2sphere.com/admin/images/file/tonaroxupewiruwifowoxute.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e096841c7d---sodisubibikigowe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=product+user+manual
    • 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_off0001053a.bin
b4286faf80d7705f23765c388c524646028fcab4c6f43b1656fbb9fd2441efdb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1053A 17716 bytes
font_01_sfnt_off00013382.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13382 16792 bytes
font_02_sfnt_off00014b99.bin
e9766b3df353bec6189932041b9e11a3bd0907856244d1d4e2ea3493f33298c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B99 10540 bytes