Malicious PDF — malware analysis report

Static analysis result for SHA-256 943e83449a7ac804…

MALICIOUS

PDF

83.0 KB Created: 2021-09-03 06:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4b39f7d8a007d03322cd6d8daa3fc8dd SHA-1: e545f52b644dcabebe14b71822583bb300691ca8 SHA-256: 943e83449a7ac8049def1978905d8ff101255863d4011238f11accab6133ca42
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad16a45989---85939399654.pdf In PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/fukitejadujezem.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/4f6a8db5fbb959f6c244b8140d06183d/93508806634.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/mukesixirawabafopolele.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfa098bce6---33674020825.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/3be01c0b0f1a914cba728195a20cca62/pidajewajoposoledadizix.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/13046682683.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e28e16e683f4aaed734f4af79d81b699/xatezaweposoponemominesak.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/16033243984.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/takaxijirajonerowiru.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/24ba58ba8c46eb6323cd19d29c68a7c6/30130037195.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16096791c24697---67346870052.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/24209988693.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/32851765795.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096cc901296a---59280879470.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160777cf6dcb5d---52996116947.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/gejapesuvuxe.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804226b8459---motuxumiwojipav.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/68769319164.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/gedejumuwo.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents//files/31497193195.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160fa1eeec1d21---bukosizez.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/nezed.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160970c9ab4961---lazodi.pdfIn PDF document text
    • https://aneri12.eu/res/file/bivewobixuzixuwefepuj.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/ranok.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb88360f49d---dejasadasikojibogabila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=probabilidade+e+estat%C3%ADstica+para+engenharia+e+ci%C3%AAncias+walpole+myers+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_off0000d2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C4 11632 bytes
SHA-256: 0a22f35833288cd1dbfd18092134b142b144c1dbd6b546f560c3cb3a3efafd93
font_01_sfnt_off0000ed80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED80 20860 bytes
SHA-256: 5a7388d9087d3ba6b79cfe17b85ed6793e8c833349e0efb6f90cab50b8244df5
font_02_sfnt_off00012280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1