Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a390dac433e82a…

MALICIOUS

PDF

80.0 KB Created: 2021-09-01 01:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 70e180f9730a0da31305b675f1988c7c SHA-1: fb92aa8d599744ae710f6b4b8b64ece462c38e96 SHA-256: 38a390dac433e82a163b2a96c503190edd01397e86b4eb6dc3208ae333aa7b08
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://triangle-electronics.com/assets/userfiles/file/sinozizokela.pdf In PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/dadabenaludotujigurosoxi.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/zopewuxexavaxotubopej.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/0c6576c96adba0a1ce9b24949c38561c/8477478720.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f97a4ac7887---72230831981.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/gajibanopolawitaxokupadi.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/siwifigiromopimisi.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082a143d1386---48831630051.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607470a0b4188---jufiwanegukerasovinapo.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/t1bb0gdpe1ls1vqkj5sigatnf2/gizodewuxutawebiditotadib.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/tagujudazamu.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/fawasobaz.pdfIn PDF document text
    • https://huanghecables.com/d/files/1522918755.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f62a67564---22762129611.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/lomakogadugonezekujonorel.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef77609987---47654713195.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/xadifigevukevewurawu.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/132ae4f388f42be23adb921d807ec3ec/47083055437.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/69edcd1ca5ef7d28cee761b450255cbb/50070050556.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1625164270.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1fdd1c5538915c9ee61f5bb35327504b/56755179785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=infection+that+eats+fleshPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/kasopetuwisepulepimet.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/05d989d436260f654e7e64dd9aa0f054/27901882808.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_off0000d820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD820 16816 bytes
SHA-256: 16165c16eaa7d5335258d15ad35a412fa1255b1f3d0864b56aaab3dc5dd489ed
font_01_sfnt_off00010355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6C 10284 bytes
SHA-256: 487e9cc52b7cf7b26f2e1c5092e41baa6fa3230bbf54d2400ef697b7929f0c2a

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