Malicious PDF — malware analysis report

Static analysis result for SHA-256 978aa693b41d0a06…

MALICIOUS

PDF

83.7 KB Created: 2021-09-04 03:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ae9b88f6460b1046030b72d2af340bb8 SHA-1: 9ae7091df1c90123bce2a30ef413fca365cc35cb SHA-256: 978aa693b41d0a069afbaad3d94e703e6fffc64494f44f5791cd951166dad0ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://euro-ex.net/images/blog//file/44528033361.pdf In PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/jmr7p7pk7nvk7sr7ag5v2agemp/44422255164.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/39840074902.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16083dbd2e5d2a---jolexazug.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/e9c2b8f784568f2dbfd4b48a7ebd4b70/13481188214.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/59032168149.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/55518538452.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7945b38d4---86133426226.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d48c86db5---gagewom.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/c9ce9383432ec2d310e67649d0207db1/vetomilokowugifexale.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e8378fad3---83333106797.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/pikowure.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f37d1893a---36874618499.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/zurexipoza.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/nidojenivujufipabedebotug.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/22614877923.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/lumokalu.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/nepilopamekuf.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/trln4nv28addfoguk6m6odsrl0/kisofinaten.pdfIn PDF document text
    • http://focostrade.com/files/20210620224559.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/wipomavesoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=shure+215+user+manualPDF 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_off0000e2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A6 17992 bytes
SHA-256: 58c2d26a0f9c0da7f4c5fc244dd6ed6d52400986e4d47c588c38405992558ca2
font_01_sfnt_off000111a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BA 10544 bytes
SHA-256: 314939cafc2b17eece372865a70ec69807c2160eae5f40afcb6216b479bc4aee

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