Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ce40d602e6ff18…

MALICIOUS

PDF

92.9 KB Created: 2021-07-07 15:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: db5ad5319bc517a950fc0b1b45057669 SHA-1: 0e8ca3d7fd009711ff69e864957a79f5603907f6 SHA-256: 35ce40d602e6ff1877c424aa8eb21a01bdd68d22a6ad2ea502103edaeeb23a93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm used for malicious redirection. ClamAV and ML classifiers strongly flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to direct users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bc0a5fd11---madexepikewamupekowel.pdf In PDF document text
    • http://alimentosldm.com/userfiles/file/pidobuzitipoxikup.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/21197337252.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072343a09fdb---49083133543.pdfIn PDF document text
    • http://safetypath.net/cms_images/52131201898.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/25937095058.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/66963781753.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076c05255f57---botapaboxokixolugez.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af10598cdf5---bemusiwikapena.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16085743456dc4---xavoxinoboxipo.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/96309837810.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ac253829f46---suwodaz.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/esfqc98maktshspa8urv4nltr2/viboxowebubimawaboboka.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/55949506108.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/85576735118.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/46525726932.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c262b55d132---pirisibumudodenanadaju.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/67994142148.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609300d30c2a9---40530663729.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3259efc21---favugifenivom.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/40402209126.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/338df467b8fca5c5112d0c3ed653b6eb/safupidasumazupegekuloxi.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/72449683151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=moving+averages+simplified+pdfPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/bofitonovexawovesara.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 17448 bytes
SHA-256: 1f36e919a9715d3bd6ba30fabcbcc35d42fda7d5db5b7a26cf5d40bbbaefff0c
font_01_sfnt_off00011fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FC 10800 bytes
SHA-256: f319d356eec5f4b752a71da8e2c08d9a687fa8bb1c2d1ce7da99c6bf56ddc247
font_03_sfnt_off000150a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A2 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7

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