Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dfb51706b0c517c…

MALICIOUS

PDF

95.2 KB Created: 2021-08-15 13:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c71279fae7454e207a83764e11725d54 SHA-1: 6b7e06f2704a4119366b95d445d58a00618176af SHA-256: 3dfb51706b0c517ce30dfddc84a91ac869c39c4f5c0fcfa06e58ba389a9e983e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV detection for phishing and trojan activity. It contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to redirect users to malicious content or phishing pages. The presence of these links suggests an attempt to leverage compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://chcial.ru/uplcv?utm_term=productos+contestados+segunda+sesion+ordinaria+cte+2019+preescolar PDF link annotation
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607be70c3fe5b---gabewet.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/c4e30b3ef794ae1482d4f420272f2300/13958411826.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/01e4e3b7a1d888d75e4904ac047ba5ef/98877903052.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/6cfe79d7511fb20e096506a6e77fbd55/xanusarazabawenimafe.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/0a80974a720ba3d74c0b99ac546c7129/worugi.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/44963737011.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/207670126960f69f144eda9.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/foseximeba.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/feramulejojulitawemasuru.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/12385639813.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13406360685.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/wuwasofejogubutesekesalaw.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/foxazesosarewesaralene.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f81937b5a0---jekulo.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/ee8a1f6720be27ba211be88f86d788f0/zafowuvilivodiriza.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/zafudejuvogumobugiligiwe.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/6ed1807f2d2d862f00c2d7e97a33f659/97516442927.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/86994993871.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/rupomidawelurabudaziz.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/233d5efa99b0a70387f9e465b74a55c1/zepixisimoxiguzulofub.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/60avgsao3bpbeshvdh7p56b044/ruxevabugatoxefofegunat.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/57061941238.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0492078c45---94420214772.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/65bc29e2340538acef28a29b7fccb142/60440307179.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/8423567306.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_off00010760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10760 11252 bytes
SHA-256: 057efa47e3497e1742777a74c22f7aa4d5e0dca1abef68c1937bd57699dda92c
font_01_sfnt_off000121bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BF 19576 bytes
SHA-256: cc457aec74651c32063478089b58dfb9648629de72892a8f6182fb6663674d0a
font_02_sfnt_off00015340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15340 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.