Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a52be56c6b6263e…

MALICIOUS

PDF

87.3 KB Created: 2021-08-02 21:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 085dbc0f103dae93dbc9a5e1c683d51d SHA-1: 85641033506e431ccbaffe895f295ad11b3d871f SHA-256: 5a52be56c6b6263e848a257f39e5770dce9377f3dcdd76d154d59ae92cbc0ef0
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'download button' heuristic and numerous links to external PDFs, some hosted on compromised CMS uploads or disposable domains, suggests a phishing or malware distribution lure. Although no scripts were extracted, the overall structure and heuristic firings point towards a malicious document designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://muratay.nl/userfiles/file/74031150823.pdf In PDF document text
    • https://businesslife.com/content/file/larobofonola.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/91652379502.pdfIn PDF document text
    • http://huntland.hu/upload/file/61962777065.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/82819807191.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/zunekuxufa.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/jajezifenu.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zegadedidazovelepu.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eefff4c06a---91238758826.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/54620915259.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9cce15169---defogodemafepogisudi.pdfIn PDF document text
    • http://51www.org/uploadfile/file/09925cd4cc1acf67e8a1b505dfe80816.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610103ed6f8f1---masigesomesixuzateka.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609768fd02a09---28438273743.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c7c3690ef---85633750474.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/biberuxe.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/3f654eaaa361dc4e060a1d25cc52d2a9/mibopatiribu.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/bidekewinusaxiv.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/vokonurelu.pdfIn PDF document text
    • https://777mto.org/contents//files/levotimuz.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/80543180192.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/8a615095b860a13a0a2b6c9439e2a8ef/4821697653.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/54977381958.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210626042524.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/tavoruwaruxumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=gta+san+andreas+for+android+free+download+apk+%2B+data+300mbPDF 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_off0000f00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00F 11308 bytes
SHA-256: 70c026c924db6ebfc357507dd9ee906016afc26d563f98d0138d044f0d4f7d39
font_01_sfnt_off00010a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001228e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228E 16732 bytes
SHA-256: 00d77b61cb546e6edcdac952e494445fb76175fb84ee88773681c1077643f2be

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