Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f52519173fca78d…

MALICIOUS

PDF

69.8 KB Created: 2021-09-03 18:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b306f404a73eb14d96a47ff3a56452be SHA-1: f5fc8460b0add1294c24ff3ce3d8809e608d6267 SHA-256: 6f52519173fca78dee97e87ebe0a2b4a1183a9dba601cee77b09fa9727b02248
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to redirect users to potentially harmful content, masquerading as legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://inwebjor.ru/uplcv?utm_term=ducati+panigale+959+service+manual+pdf PDF link annotation
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/478de3b8e92fd228a5775b7ed493521e/52817590112.pdfIn PDF document text
    • http://redsky.tv/userfiles/files/27783265294.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac43061f79c---88925993365.pdfIn PDF document text
    • https://birutelorasin.com/contents//files/76266690242.pdfIn PDF document text
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/b36f51c783ce4798875b623a232a13f1/53424409106.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/17109706041.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160857c9ce8f06---47346569392.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/4dc6e804397343742ce5b2c4924e538a/fobibasolotazesukiz.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/75cla8fmfkp9s0k80ispk4d3d3/35991927402.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb29c311202---55394090196.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/71658134467.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_off0000ab0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31E 17384 bytes
SHA-256: fbf4a70e5bba3abd6e6d349fe68dd807c3e5bc48f1cf48cf2e1dfa6daa1b1041
font_02_sfnt_off0000f011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF011 11312 bytes
SHA-256: 9b74b7d1397ed62b7ecc922c689d3e53425a9307d111f12a28a2f44179cbd954

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