Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8682b17a218fe2…

MALICIOUS

PDF

84.2 KB Created: 2021-08-26 07:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5db386b9eb9ce4b67ce8d4ec152919b7 SHA-1: b15bdcaf188bd16f39ba3906d09506a78c5343ea SHA-256: 3d8682b17a218fe219349d70d082ded450e1827d08263cdc97e1d3fd5edcf3a2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca882169f6---judadena.pdf In PDF document text
    • https://natyabio.com/uploadfiles/70800452844.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/guvuwa.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/28556280955.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4ae482ed---rajogilarevogikogaruz.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/10656787405.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/e0424486ea39d57bbcb95131dc861d14/11389290897.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/jipoxovetu.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0fa8e4670---31875493693.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/9634273142cdc3f6027f9e2d6c4dc8f8/wesaxen.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16093b30c5d0a2---lebukebaxirerinuxaw.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/97102647486.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/d6lhlu4v3eua7g82os28omasl1/86970734519.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160736ed117172---xosumegutifugoluruz.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/vajunufarukukulino.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/u27ub4at0m4e9ir5j9segnec48/wononomonokonidigin.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/4b1585038a59a60f486222e51a11ac3e/77860059373.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/4229010860.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160984cbfefc92---11823610556.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2a5627ad7---16898973580.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/26609003859.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/39790ee7196adbc1a9bb4d3344a539c9/60455998720.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/e8d6bff2b5111c2478dd4c8d78bdd5fd/36189532528.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/vezadusikof.pdfIn PDF document text
    • https://menu2uplus.com/images/file/rinaladureguvedujerivagut.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/25875898616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=muscle+tremors+in+legsPDF 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_off0000e7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 10504 bytes
SHA-256: 123becc4dbd666b5cbc2e4a80538f943ff1be11d5b82931e3d341e8c16284ede
font_02_sfnt_off000117e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E1 16492 bytes
SHA-256: d0d881fdb4a39758dd8f879ab35f90cd05da90c220ec795a19d82258e691e92c