Malicious PDF — malware analysis report

Static analysis result for SHA-256 391c89320d5d935b…

MALICIOUS

PDF

73.5 KB Created: 2021-09-19 19:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0c9f73a32c56c296e2a54c5992604d28 SHA-1: 739bc89e4b28a6d865f9ba00c56eb5ebdf75caab SHA-256: 391c89320d5d935b4357731ca59c734e3fc5e7920a58e7d373bf0243beb79ec0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and link farms, indicating a phishing or malware distribution attempt. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://wastran.ru/uplcv?utm_term=android+dual+sim+dual+core PDF link annotation
    • https://dp-engineers.com/admin/userfiles/file/62354149643.pdfIn PDF document text
    • http://samtle.net/ckupload/files/73526624249.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/lugomabenat.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/vokitevezoja.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/64391809152.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210910025844.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/magisemun.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/6946078685.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/91190402308.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcbcebd6b3---jononodavililide.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16133ba5c6d04e---tipezarowuworusa.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/21772011631.pdfIn PDF document text
    • http://sbairs.com/datas/files/nebomenuw.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/29936449968.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/6123f5b4a34e0d3f2a531e0a80f4f25c/duwatigalobonisodasetesi.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/251847077.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/58561550001.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613642f417156---boziwavuxogin.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/lebires.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/vikevonavilalidu.pdfIn PDF document text
    • https://deepex.hu/hirek/files/sakamamadugasuz.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/saxosumeboxutanukob.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/madadilunebabi.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/g4lvigr67gresh7hcciscp51vv/19885050127.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/zinopexukodefaxo.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/31145871266.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_off0000ba01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA01 10512 bytes
SHA-256: 5a5fcb2a25ee4a28a54dd8f81b8ec14479fa91d0551fd631d21b30d704b78e03
font_01_sfnt_off0000d1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E2 18104 bytes
SHA-256: 9338bb94f43062d7e0e08e401dd5aed2e05e0445fe601344eddd2bf806bd5879
font_02_sfnt_off000100d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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