Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f39e2e5eeb7635e…

MALICIOUS

PDF

111.8 KB Created: 2021-07-13 01:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5bd304d62ab8e81d775ebb6f62d22dc1 SHA-1: ce097fa3ae0409f01f5834f52f9f3c9c87476172 SHA-256: 3f39e2e5eeb7635e28ffbbe0dce708591468f09d10039391fea9cc1b8313e2a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate that this document is likely designed to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/a14f29ecc8a08317f438894ed2e8563d/18750355721.pdf In PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081f103ad14a---63651816262.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1774d2ce24---pifalaveweravob.pdfIn PDF document text
    • http://falerisztika.hu/tmp/77794099417.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd16d47dca---zeguvarifeviwonamixev.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c412b6d25f2---28281080308.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/6fkia4ikk2et90u7pcmcu131bf/15890495349.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607302d33c0b4---24553181581.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a347d32c2f9---80496807131.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609651a0e9c49---vagiwokanuginuxinoxab.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/l5mt76bollf91m9qr4qaamjo1b/22353515507.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/c1eafe22783926a130427873e150a5d6/19415968296.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/xureketareja.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2f1307a4cc48a89eab7a14118dd40a2c/venamekejiwemimotebe.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/77b69c599407de6d13a25052319a39fe/549319412.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c589a70dd7c---57644450754.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/2i9jgu65qosvdd42min4qapv9t/65289507109.pdfIn PDF document text
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/bobirezunegegamonelalifug.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/fujosetotavupopegev.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/nukulolupujiluputufes.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/zugoxulude.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210707_477C891E891FF7C6.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/a4a39765db8d14a038bd7c73b8300b2c/masetatakax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=constitution+of+india+all+articles+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_off0001547e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1547E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C90 17116 bytes
SHA-256: 9572ab8c1be68cc1909462d080290e4e6c42c055e862d19c4a8d056486938ca2
font_02_sfnt_off00019950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19950 10744 bytes
SHA-256: caf57e141b4eb7382dd385d4453c81f64052be66858fd8e592061e60e77d8a81

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