Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d290925671ac05…

MALICIOUS

PDF

75.9 KB Created: 2021-09-02 00:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f69c9655aeebdfbf9ddc1dbd2b4687c5 SHA-1: 3beb4e5492cbad433190689d4b1acef3ad8da5ce SHA-256: 83d290925671ac05794ec050d79f6578eda073246b52e10f7a468becae053fa7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, several of which point to compromised WordPress upload directories, indicating a potential distribution point for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL analysis point towards a malicious document designed to lure users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://villa-carlshorst.de/sites/default/files/file/dotasabanafuzi.pdf In PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/bivobovudizaferemabijoj.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e769624a5---37668300656.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/ed8ff3844eaca48b8d45fb0174f68bc2/purakevadulifimewiravowo.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/20788912350.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/dazalelimiloxajewezinap.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/83853402427.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/lipoliw.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f9023fa98---30810524394.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/fusuxamoduzorebo.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/20927365568.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/kfhck7c46adll8nslctd3bul52/nobemizamozidu.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afd7874d019---fuvadolivopaditofinif.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/xovexa.pdfIn PDF document text
    • https://basisangka.com/contents/files/36258562189.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160989914aedc9---fumigasojaluxotonejapi.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608026080c283---58151507541.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/25286360449.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a0c02e806bc4593d1c70c905effdb4c0/18274670578.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a0592bc29d8---43910809196.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/fff46c1b5e9dec6757ee735eb810b539/wubumigajusukitizibizo.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/naweforobubikuti.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///kutisijejeme.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/42661855546.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/mefinilasidulumuxabe.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/lojipizaxap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=magnus+chase+and+the+sword+of+summer+epubPDF 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_off0000c42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42F 11248 bytes
SHA-256: b83f8e3e1c677412b9097823c07cc37e985282e9aafd4e140ce058688cdb1ae0
font_01_sfnt_off0000de0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0A 16436 bytes
SHA-256: 69692a88c84a58aa58831704e45bc4327285886e27188846347283930d54c416
font_02_sfnt_off00010885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10885 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.