Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f56a0b7d9d4e0d…

MALICIOUS

PDF

76.0 KB Created: 2021-09-03 08:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 93ebbedb896872541324a8410faa6ea7 SHA-1: 530b89e5ad2237e56c6bba54496fa22dffad8edc SHA-256: 70f56a0b7d9d4e0dbef1b46b0416674b967bcc2b4f4bc43a7335c0c1a6b1a5ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous URLs pointing to compromised WordPress sites, suggesting a link farm designed to distribute further malware. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c8e43f599---42608927604.pdf In PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/7038687068.pdfIn PDF document text
    • https://zold-kommando.hu/files/6126699860.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d76333d62ba---64989091004.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/13704689857.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/29647164810.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/1cc5a19cfd7ec8f6defd1ebb8b5e7d65/94982252677.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/85881117068.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24496889396.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/nuter.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/72770177680.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/94233025983.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/53966151983.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83accc49f---bejoj.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/neteluvedabefuki.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608eaecd3003d---26033758542.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/buzolixibanoden.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa074d21fc5---korizuwamu.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/dafubonejeraranikefopixiw.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ed6f75c70---80466248949.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608607771b905---96177668586.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/xuwonegigadupugalikutes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=abraham+maslow+piramide+de+necesidades+humanas+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_off0000c4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE1 17368 bytes
SHA-256: 3ad327a2b00adc87e737ae5f99fa90bd35bbcb93a7f15e37a114385f72660f1d
font_02_sfnt_off00010888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10888 11096 bytes
SHA-256: 018595b9dd180879d8f657e93b6cb7e3a22de030552a37aaa89ad1de4ac4daa3

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