Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d51d39d2916c1bd…

MALICIOUS

PDF

93.2 KB Created: 2021-07-30 17:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e6f5231f122045fc612c3d95344ce2d2 SHA-1: 341c20c37dffe0c00a07831d4aa1a8e2f994d296 SHA-256: 3d51d39d2916c1bd27bd3761871caf2908a6a61ce1efc23a12189b96c37a9c18
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The presence of links on compromised CMS uploads suggests an attempt to leverage trusted domains for malicious purposes.

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 http://stevis.cz/files/file/dejerunub.pdf In PDF document text
    • https://giga-tronics.com/userfiles/files/fifupulaxaletuto.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/15339575685.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd1ee3a8d7---16550091144.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/luraloxowakuzu.pdfIn PDF document text
    • http://mcelvain2020reunion.com/clients/b/b5/b5167212b805812c9439186484f80f5e/File/zowatugofisotebapefig.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210727_561AF99AC83E2468.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/14066356085.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/78035969088.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4172932024.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/90676912092.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d2775b90e---puzuwiga.pdfIn PDF document text
    • http://grimastone.ru/files/34801593862.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///28980496842.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7d2ac97a612c2f1715c33ef624c192da/26462807184.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608da7b58d3bc---sopoxijin.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/kazirutiwuroleful.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/54827892440.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608693d61e96c---tarozafiwaxo.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c488bd6f423---79926565017.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/xurezesuxigedizojobakage.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/dadiwadovufideragabage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=cts+technical+interview+questions+and+answers+for+freshers+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7B 11144 bytes
SHA-256: a210a674580ca6b99e2b9c132643098490b0a9931cb04fc1d685c4866fbf25bd
font_02_sfnt_off00013551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13551 18400 bytes
SHA-256: 879bf2960d067ddbac4bdb7dfc90ee52740217dacfc48a70ea6f18fce6baba04

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