Malicious PDF — malware analysis report

Static analysis result for SHA-256 b661bf7ba91ca95c…

MALICIOUS

PDF

74.9 KB Created: 2021-09-06 22:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e0874ae6f2b2921956263a857276cb97 SHA-1: 93c7d1212e957326e41c9e6ba548b23e0e310dc8 SHA-256: b661bf7ba91ca95cfa3a93d18afb2c39eaf979c32d7c634160208f3aab98cb17
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing formcraft plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of link farms on disposable hosting and compromised CMS uploads suggests an attempt to obscure the true destination and leverage vulnerable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093a76655ea0---labukelagijuzoz.pdf In PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/gekoxarofaxufovijazokudes.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/ff16fab5c0a14550b75f0f276e7647f2/76109742957.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/wufikiduwibene.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/osp4dvn95t48rqdaihprhukkct/12780311172.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/b027d086135358e2da3199d203217bd8/77618647210.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/92470594379.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/17641124408.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210714141001154.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad65970b70---40481122805.pdfIn PDF document text
    • http://vodnik48.ru/content/file/9293052054.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/gbach7q7fdrldv8eum64odd167/navanolitovonofidofodo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346c11bcade---27213418329.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/30157360319.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd2917f1fe---18833061927.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/14597352324.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/lovutijosulefuvurofo.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a2236c50e6a---kofewupewoxibi.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210611133516_ciap3j.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5011de637---93645969606.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608a385546ac7---25648815667.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ea8f24238---nulubonugupinu.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/gesuwan.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/26786964569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=docker+tutorial+pdf+espa%C3%B1olPDF 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_off0000bd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AF 10908 bytes
SHA-256: 99d4029a7e3f5284dd89a9826cb68e71d78b18056be2692e789e2df4ae511540
font_02_sfnt_off0000ef03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 17308 bytes
SHA-256: 02e22ad4f8908939b72df8f3057c441ccada63099a7ed114220f2ebd84237b8d

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