Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38f86b8734b4632…

MALICIOUS

PDF

102.2 KB Created: 2021-08-09 19:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 95635ae6b2df902d670388f91136d28f SHA-1: 0dd9a482ffa7c94bc839fcdf67396eb0a109be2f SHA-256: c38f86b8734b46320f92df22fcd3da0b3b7d526e7cd8a506fd5199e05322893f
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites that host further malicious PDF files, suggesting a multi-stage attack. The presence of numerous links to potentially compromised CMS upload directories reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9692

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 http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68dff4d5e4---24711530621.pdf In PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16098e46ec49ae---ruwukebexometajobolibafum.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/su4apti49iig7tmn04saq2ft61/69467043570.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/xetaredofujijukizenidub.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/temurugufeliparaluluvujan.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d21a405eaef---64946016561.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078a0c63918e---99250976878.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/lokefegaxejirikoxulifag.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/zutazujeduviwabidipuro.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/76760766940.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/ledigelifemurop.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/pif4s9gaqcjer7cv699krohar6/52680476638.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/64492533023.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/41696243588.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1610d387feeb89---vurepibidok.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b054d2ca10f---68495824780.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3de8b69f4---72191924189.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ec43976f0d9---gajonanipepusipebabexud.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ada9945829---67934077592.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609442f03cd48---loforiruwaxusow.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///68682571767.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/sapizozuru.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/2e1a12f18b2d3a2668258116e2e95782/2603643500.pdfIn PDF document text
    • https://fishboat.hr/files/nivomimesuwafopovidixiw.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/besoxuzakutumuj.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/5817481576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=who+is+the+egyptian+goddess+bastetPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E10 20184 bytes
SHA-256: 4b036590ee55bf4f06ffa9b065f6a1a357e8ba1d21860656d4928b795a853e9e
font_01_sfnt_off000142b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AC1 16104 bytes
SHA-256: 741d75bdb569c88f252336e4397a3e82a4050fabe9e1ff09c52484b1002b1a60
font_03_sfnt_off00017012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17012 10772 bytes
SHA-256: bdc85e2ad53230f37a49114fbba6f8f89325ffda0441bfabd3480d2df1fb6c8c

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