Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca9f6ed7de3db43…

MALICIOUS

PDF

87.3 KB Created: 2021-09-03 11:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d41f7017f7b2c33b53d212feeacf212f SHA-1: ba4c433c07be784ae771682df97aa4df35066376 SHA-256: dca9f6ed7de3db43eea7ed52b0cc8aed4ef6918198014affa258e9a3cae40b3e
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The presence of multiple external URIs and the nature of the hosting suggest this PDF is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=pang-uri+worksheets+ppt PDF link annotation
    • https://markyatirim.com/resimler/files/52984169121.pdfIn PDF document text
    • http://datcat.vn/2018/file/7074016250.pdfIn PDF document text
    • http://mextro.de/upload/files/91709399773.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161158c8b1042b---lunikegaluna.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/c9e8b2a650f146f76ca560000fed7e57/53068411256.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/gibaxobuxugenavisove.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/jinufavexopawusaketasup.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/68888274762.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6140034679---jepetobamedewizuj.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd4ff73431---lixuvufilejipurelaro.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/824s8fjqh2hcsdqttqlvnnou2o/sikumusifele.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/sefujokeremuputanawofis.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607f20834db38---60842235233.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/3803351303.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/c81225253c6b25bab4fb6f2cbbe62e9e/65598063617.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/25909403269.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/08ee595c2a7d14737b98a153f65c8d8e/41382953299.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/82323378932.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/k9e5i79ja69jbi68bsa4n8j1s5/xagewubixudavebagowajem.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8df7dd8a5---xujasomufosevo.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/tilozafawowirosadijawi.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/koforonuvivarufekapim.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210528223338.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/52655867286.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/zagazobepe.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_off0000e921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE921 20900 bytes
SHA-256: 1becc154014dc4f3d1b99e1f526e13b44faa13650d7d1ad87772d6a703584ef4
font_01_sfnt_off00011f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F18 10800 bytes
SHA-256: e0d2f9d805085ec72f444eafd2830ceba49f4cfde8ad0097fc2762729b9dbc87
font_02_sfnt_off00013812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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