Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e8d66a3ce42cac…

MALICIOUS

PDF

85.9 KB Created: 2021-08-15 14:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d029acb8ae011200457d0f86e1647129 SHA-1: 0f6b9748b781bb4c9897f7a999ae88ac21383140 SHA-256: 71e8d66a3ce42cac90a713dec34d6c2f39d6b039a2cbabda8db7f7397c57a2ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content. Heuristics and ML classification strongly suggest malicious intent, with ClamAV identifying it as a phishing trojan. The document body is heavily obfuscated and unreadable, but the presence of multiple distinct hosts and link farm patterns points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d92b22d1922---xetumidenita.pdf In PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e029d9c01fa---doderobukaje.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd251ec344---7811230582.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/luvarofufibewuwuwimapefa.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/piwotososof.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/jetitoxapukafifapufe.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/4697df0873cbbd379fde752487507f82/61100444694.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4834a04cf---41254871423.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7312d27b98cc1ffc1651317c87adf050/tudopilonos.pdfIn PDF document text
    • https://digireg.si/upload/9174086276.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/49920711418.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/34468172881.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/58afc2b6f98ae1f593619c82c71832aa/rumuteduxexebitume.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cae270bc52---35059580598.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fdca772e9---82983797030.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/gkpcsf8ufg0i1rqmem2q3r4341/bemejasu.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/79785716751.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/9d53bde5cba6be689a7da78d8a9a0f95/wemoj.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/b2cba154a7e1f59a30ed5456836f4e8e/wivutujebodi.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/10193866769.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/83ab41e9a76d6d0409f26e9b51ce750f/tuvujexep.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/xiwewajot.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/0mdeg60csdi9nefmek791u0av6/82848464822.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/71858940514.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e183eb07b5---kejidatidelujudaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=caracteristicas+y+propiedades+de+los+enlaces+ionicos+covalentes+y+metalicosPDF 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_off0000e758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6A 17980 bytes
SHA-256: e64427002225260692d63349155545547521d53334727deafd3dfef0001f2fdc
font_02_sfnt_off00012d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5D 10888 bytes
SHA-256: cb01d12e71921423921e393ffa0b93e83946c25b22e4abf04ae839e0a1e07f22

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