Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e71c0ac8ca029a3…

MALICIOUS

PDF

99.7 KB Created: 2021-07-02 04:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 393c80eadd3bc497b28a9ed4c639e4d5 SHA-1: 8262035b26c4c9afbebdf2dacc7fad321e39544b SHA-256: 8e71c0ac8ca029a3de803fc6bd972381620ff1caf86094123e634e7e3f75c0a6
156 Risk Score

Malware Insights

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

This PDF file functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links likely lead to further malicious documents or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://drafthe.ru/uplcv?utm_term=hack+angry+birds+star+wars+2 PDF link annotation
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f852789fa---28573646817.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0164adeb4---64042578797.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/69865198673.pdfIn PDF document text
    • http://www.toptehnik.si/images/7564079649.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/234c0bed91a209409cb454df6332b3a9/vimekagenapibosoxirowavug.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/229d185ca7ec4218a044b1bb329af575/74746970170.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/27347518240.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/23d8561d387ca5864301703c1f32f2ec/17588035530.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b4fdd30d0---xewopagidazigazedidom.pdfIn PDF document text
    • http://elm3rad.com/file/dadolupavedojekaziwonowa.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/19c3421d7cf8852af6ac8b3d86d17fad/4600756705.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e0b6306e8---kasus.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/20b68e525bae2cdc5d9e5ca19fd8841f/71796242257.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752155aebd1---28168578837.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/vlk5b14o95imbp1cku5sn8c1o0/zevokejalujefekuner.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad9a324c23---visobenekovenele.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/43365668995.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084a5a8600ae---kilulaximonofanud.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/fb25e7b4b673caf88cae00f9508af607/boxobigavoxetaxifew.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/khtqmipe98ekkq2giicpkj76b1/95945933032.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5vk8klu6vm9jft5l07ri7k1l51/60979262431.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/8qtlvutvlcicd0l5h1j7nt3si8/kekelupeganebisidoweso.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/34542088649.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a083fc2a30---33169045995.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607170b37f314---49797718382.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93f963523c---76420038732.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_off00011c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C70 10788 bytes
SHA-256: 1437f8339605110c0e1541e7be99ff70b3270ed66dce4ee7cd5518b90f3e1e57
font_01_sfnt_off00013553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D65 21148 bytes
SHA-256: 8765b0286ef772c0c5c7a21a5e26afd2660a1e87650e0606a510dd080be16edd

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