Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf43b60c7a68cd1…

MALICIOUS

PDF

68.3 KB Created: 2021-09-28 17:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7d6de41f21f4f2c4843444953d2accf3 SHA-1: 98acdc7902a7f3e357be1246e1300b2406c72101 SHA-256: fcf43b60c7a68cd1ac6c7de00c247a282e2372d3c3268fbf5371f7d79d572a23
196 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing lure, including a small file size and an image-only presentation designed to obscure clickable links. Multiple heuristics indicate the document contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://teplicky-fotograf.robert-zauer.cz/userfiles/file/tapavokoxafapuvoludage.pdf In PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/metizafitugo.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613a721e30c18---92141523998.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/zobuburezitafapufodanovid.pdfIn PDF document text
    • https://signika.pl/Upload/file/9909419629.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/95461575345.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615080032b2bf---10735309248.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/womuserejam.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/66725051723.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lakabafokajodukumujuj.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161409d8c5ea9b---wupudasewawadijefesote.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/87339068100.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/lowixawaxuwuxolalenim.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/danigelitalisapomal.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/52664688770.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/wudufudi.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/51269528525.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613258b62a342---doradewul.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139087bc1f34---notalepubafudep.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/17087636105.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/24836251108.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/9969018247.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/baa3f1b7c8c776eea43036c0b02ddf31/lalosodiguluguvibuv.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/79471547089.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/mesepajonepe.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-9/20210909022631334719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=pdf+cropper+downloadPDF 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_off0000b0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A9 14168 bytes
SHA-256: 7df85589b52cf2ee3dfc9539752d03013c175ae29ab961d73bbfb87fa2650918
font_01_sfnt_off0000d3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC12 10344 bytes
SHA-256: c41fc634f77377cbedb9c5494c579e3ee8c153fb4b41fa5255c908ba640b7a1e

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