Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb48f7a122cb92e9…

MALICIOUS

PDF

134.9 KB Created: 2021-08-08 14:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5db39f53b5799c271d41208ad98a4e89 SHA-1: 4f6e3d43ba11b16363accb81ddcb5f576a1f0bfe SHA-256: bb48f7a122cb92e9f27344cdc012308094fe9f3f08bb7e436a8a7c6204311865
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 websites or disposable hosting, indicating a link farm designed to deceive users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.avantagesapp.com/uploads/files/9119408564.pdf In PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/dezanafolosuse.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210724_574EDBF489F91B65.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/95305060326.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5dfb2hom3mrmhjue15gtee219/lefetitomuvududom.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/900c154618b0a79142931f7607b1dd4f/wopamomufekafe.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/52722079325.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/rogigawugibejuxow.pdfIn PDF document text
    • http://sherylrobphotos.com/clients/56056/File/7467897739.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/vebgcd1cp4db3ijjmdebmtohe2/97929990676.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/ri0e0lfnlufbu8vdggvo8hgvf7/97981094738.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072964f38dc3---zoxadazadi.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/kixadaburavexujamezupepo.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a9453b1dd04---pafutekowaxapope.pdfIn PDF document text
    • http://abpaluso.com/upload/file/71555662754.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/46901204186.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/7666706681.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb52d51cf0---35305312473.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5kiau57lugecm4ghij5kgmi722/nopisezimevazimi.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a3269eb205613c78a6ec40c8262b9ed7/gukudusafibojogesusad.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/fotuzupowuludubipaf.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/74975906944.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/58578526924.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/begikobigas.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/98425693489.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/894a47c99b250abbd7268763a0c00687/womunivujota.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ab90c362683a647f7317526491ff7968/12022178470.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/vonixenivarufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=100+verbos+irregulares+en+ingles+presente+pasado+y+participio+y+significadoPDF 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_off0001abde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABDE 18120 bytes
SHA-256: 2d6c5ba4f46897f266227598b5364407ac5a6f8fef8911fe9d8d47cfdb000ded
font_01_sfnt_off0001d9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D9F3 11292 bytes
SHA-256: 1f72c5223899e0e6e40e5d4edf9cb75dd2bd10682da1814fe4c1e962e7f6e9ac
font_02_sfnt_off0001f43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F43D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1