Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9fd40119b82af8b…

MALICIOUS

PDF

90.7 KB Created: 2021-08-20 13:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: acc810d784b28e2f30c4d5b74acdb7ab SHA-1: ee88a78d72869fbef37e3b787e89fa6649184e6c SHA-256: f9fd40119b82af8b390af71555d195eea40aa4491f4d35dd89aa313695d45c56
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the heuristic firings and URL analysis confirm the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://banghetretunhien.com/media/ftp/file/zomivoxenegazozopos.pdf In PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/hapr8vkajfnmnd1m6529ooe485/32145895005.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/bulobisanenivakapexemudub.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/32138968d70d529e4a6907312bb8da6f/89492110028.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210813134145.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/25393696117.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/37378726422.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/jogesimifetadozilidorum.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/77b20b24d4055b8b3861d4192fdcc14b/tusetejatunupazak.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/317k4qi8ft1lb01cl72ncjvhbu/45945708214.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/pafevijema.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/mafewude.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f3b5a8a2d1d---64443576610.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/xivefedirinusosaleju.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f147ac3c41c---dolosar.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/noguk.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/dewageme.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/472f8cfe741aa30f38677a3ccba069bf/fitaliweris.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16071a168aed25---zorenifo.pdfIn PDF document text
    • http://markone-tools.com/upload/files/mizajipokudujaxasanojod.pdfIn PDF document text
    • https://rotherelectric.com/files/minedazotuput.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161087eccadad5---56772250630.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/nebakewojunonedezima.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/81cd800446fa07b7cc9aadc0a0c39684/gijiraxatudadedelaganuzer.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/8nhvt8d16rpk83a8qcopb02k1u/womoberigapowowakep.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160daf71615f87---voxivegatisuxek.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/91865250816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=buffer+solutions+in+blood+chemguide+ukPDF 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_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 11148 bytes
SHA-256: 498aa29b99c070912f3f45a9212cfb597582da7bebcfe8a55571fedd8bd84162
font_01_sfnt_off00011741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11741 17304 bytes
SHA-256: a4b31f5f220344c654cae9c9c906b5401197108754482c1e5a7fe885de5f56df
font_02_sfnt_off00014425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1