Malicious PDF — malware analysis report

Static analysis result for SHA-256 656c8ea1af133182…

MALICIOUS

PDF

92.0 KB Created: 2021-07-22 19:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: d86399897ab9cec201c75fea1b52cebf SHA-1: 6472f00510063ba6397a72cad700d30f15c4ec48 SHA-256: 656c8ea1af133182f728ce6144a9f1f4e36b2ecaf06ada5b0011b7616747bdd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/se3nq34vd0682ottht29dhpbq0/15577528845.pdf In PDF document text
    • http://ceskylakros.cz/userfiles/file/88473631579.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/69761558984.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/5f47b231e678da893ed544b45580a806/zuzowopirefedetusa.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a35dc35d1---39149851628.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c45c8d2d7a---jikipipuxenixa.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///46175161709.pdfIn PDF document text
    • https://bloc-immo.com/images/govedojusokuforulategon.pdfIn PDF document text
    • http://meadclassof1991.com/clients/c/cc/cc689d7a74a098ef67b43942063c7ff9/File/gujadinaturirijiwuxik.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/77ch42vgm321a8lin24gn4cnu6/tagamuradepunizipazizeti.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/jatigefufuxuzepikor.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/38388577665.pdfIn PDF document text
    • http://gardatrans.com/content/Files/melejosu.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/71448564099.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/4d0f4fc5c31c81d57177715f074eec53/rivebenumaja.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/79873621854.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/95d5ae10770cc11d51fd350ca3d813a5/gijamojanoxajomowefuse.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/27718682289.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/vuferujaxigafo.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/lurepurudefuzuxek.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23510852670.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb400949d1---gebajikemotepufefozezutun.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c68d1509f---12485197551.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d95549719---dutulirebepekusoxuxivez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=world+history+sol+study+guidePDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e23f39729727cb0f5447c00bbf8dcec1/78100782300.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_off00010637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10637 10468 bytes
SHA-256: 212b1f07e52b2f97af3f5ea6ce32cd956626afc842bcec2566b2a9f1880820e4
font_01_sfnt_off00011df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF3 16840 bytes
SHA-256: e2b69ce319b71a1fe8bf3a4f8eadb59aed3517fbfeee2c9926be58d3e98f6e82
font_02_sfnt_off000149b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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