Malicious PDF — malware analysis report

Static analysis result for SHA-256 017e81467351775c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-14 02:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9dc45aea38933a37730e6f36380db6e2 SHA-1: 4617807c222dc847eaddae6d685846c07f69378e SHA-256: 017e81467351775c869fc872af05e037c850287fb5ea6d891e380abbc50249b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF being a link farm, directing users to various suspicious domains, some of which are hosted on compromised CMS uploads. The presence of external URIs and link farms suggests the document's primary purpose is to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://smidgel.ru/uplcv?utm_term=application+lookout+android PDF link annotation
    • http://miyisz.com/mingyi/images/userfiles/file/87637284404.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/logejotewewolokilutalor.pdfIn PDF document text
    • http://remobudostol.pl/pliki/dulazewip.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/tigoguver.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/45943832356.pdfIn PDF document text
    • http://coumert.com/images/file/49496217330.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/jakokajatelowadorolo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4cb5c1c98---12055601285.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/77609235418.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/latojinumemasarotidabaju.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/3aa6c6816f050c76f780e50e8e65be1e/dutizojugugeworogukupuvom.pdfIn PDF document text
    • https://doitoutdoorz.com/file/Jb8ofxiV3AOqXNn8.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/xozoxilomazog.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367323497d1---pevujimusujigawapuga.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/bebonozune.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/37275018522.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/85361856112.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/59044374209.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613523116a318---75159240181.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/fafaxesaxanagotapanugebo.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/97953494942.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/roxegopojevadixu.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/dbc63dd5f647cee380f564084eaa5b88/81187583062.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/supufanubofe.pdfIn PDF document text
    • 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_off0000d7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE0 17384 bytes
SHA-256: 84bbb7617e171975a4eed69c13f9b8dc257ee3cda60f150863f308ab5a001dc6
font_02_sfnt_off00011d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0A 10380 bytes
SHA-256: c5d9ea46203cb6d1f494c2578917b3d58d527372576997833b50a5f197a5acba

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