Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49111823d1ed064…

MALICIOUS

PDF

79.0 KB Created: 2021-09-09 15:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ba154f073a383d1885bbb7918be5cacb SHA-1: 2a283173c369ba66d7a1fffd0c7d2f1ea9307a50 SHA-256: d49111823d1ed064d21d6497d6df39113e142624853c03ad0003d7fd5f779b9b
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 websites or disposable hosting, indicating a link farm designed to distribute traffic. Heuristics suggest it's a phishing or malicious PDF, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged it as malicious. No scripts were extracted, but the primary attack pattern involves luring users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://lnimeina.it/userfiles/files/pixomejekuvibako.pdf In PDF document text
    • https://lmbri.com/WYSIWYGImage/file/22434271323.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613032179a1bd---raxisadirososatefip.pdfIn PDF document text
    • http://unseretochter.com/images/file/40149627601.pdfIn PDF document text
    • http://rayer.cn/d/files/movexosu.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/lazixovotebobaj.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/wugivefukunutedimiruk.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/lugikoninuxubawitusape.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/62628565312.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/tapamolazologiminarozifap.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/vabesipobixidewuli.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff5f0f1fe5---68521806213.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-2/20210902104453356329.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46036478314.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/bajazojigukugomuv.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/33903443210.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/vogodoxalet.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f392991f76---kuzojilalubato.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///14440756692.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613587d9246a5---kojuvoxuzebedajomuxasow.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/kivotovarawegipesobuworus.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613791aa5066d---46833616278.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/rogudonajeminajakubos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=gta+san+andreas+cheat+apk+for+androidPDF 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_off0000d10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10E 10800 bytes
SHA-256: 322a24cc0268f0017f3451efa2a7889ab90ff529523f297cafa3f0d895dd08da
font_01_sfnt_off0000e9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FB 17380 bytes
SHA-256: 2e005754dae20e94a6b22dd769a9f4749cfcb68dcdd36fa68df67ce8d1e5941f

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