Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b571dabd06b0158…

MALICIOUS

PDF

95.8 KB Created: 2021-09-05 07:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4b1b80979ffbe3b5653b12dbe5ea858b SHA-1: 907db1eabf96aaead665c7ceba261ab5fd11479d SHA-256: 2b571dabd06b01587abd639fbc5c6f9f78247c76c1f7d97494b87623b0edcef6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://bacsionline.net/userfiles/file/52736960934.pdf In PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/12cl8if0tsjqlqed4h2hipic6a/63328463610.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/50818949651.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d63af381441---37260323286.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/42864672078.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/27ae61d21dbc6faf7c9373fc34cfe7f6/16472498684.pdfIn PDF document text
    • http://midel.me/userfiles/file/nunugobenajasijefedivi.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/nadamevotofufelininajezo.pdfIn PDF document text
    • http://goodmax.ru/i/files/taxogasozifiranafoxi.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/lusatulabutogud.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/zosenodakotavolexavaza.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/9fuf4tf1qcp8kjs8lci3readhp/80245103682.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/58318481447.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/xonozotopabug.pdfIn PDF document text
    • http://msiutilities.biz/documents/88809872253.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/44356332917.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/21571747781.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/zobafo.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094780574b36---45061868797.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e7bae5061---39621162382.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/vk7kc7nfn9s62jdjm4vr1608d2/74478275910.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/46730308317.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/29162831455.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a1aa200f864---952237174.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9f4b6d7f2---35093962414.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2ad011b00e8140cb4640534d291c41d4/38584526947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=nickel+and+dimed+10th+anniversary+edition+pdfPDF 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_off00010e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E30 18700 bytes
SHA-256: d0a50e41b3122232bbe002ab10085803df111a939da186fe7ec0fd925e1737af
font_01_sfnt_off00013e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2F 11308 bytes
SHA-256: 9ae80a089e8aead46955007647b669268ffec7a0017da1d9d141cb1c7a3a67aa
font_02_sfnt_off000158a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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