Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43240f771ede87d…

MALICIOUS

PDF

79.4 KB Created: 2021-09-21 03:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0d66eaa4a9b4bd294d1226226067b1d8 SHA-1: 2bcc596d333aeb8cd859bd7c78bb6e89940784b2 SHA-256: f43240f771ede87dbb7758144977779d5bf3689513e14b7e8e16cdfb4dc2b54e
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The presence of JavaScript and the nature of the URLs suggest an attempt to redirect users to malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=sip+free+android PDF link annotation
    • http://ratchadatitan.com/UserFiles/File/nekibukawipoxiwos.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/64937730309.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/67522106007.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/pijamakolulijuvevawebafe.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303ed2db981---futuzo.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/buvunigazef.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/temavuf.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/bf39efe4adb1770ec05ed3ff76adf34e/3591563274.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/gegawul.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/644ef82eb6cd5f242e6d780890432112.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/78866197347.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/norivuwewujog.pdfIn PDF document text
    • https://norservis.info/files/files/kavet.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/xawivixavawipotowarexon.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/f415a37fbaee59d0e61a43e7a0dbd96e/buvek.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/tovarupatefuxad.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/vufalawefunokilep.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/dagogaxizun.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109170653504714.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/8019212429.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/venevag.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/dagamubutinajevunis.pdfIn PDF document text
    • http://obedovice.cz/userfiles/file/67241810696.pdfIn PDF document text
    • 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_off0000d3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AE 17684 bytes
SHA-256: a94c348a6c799c31ce7a0ba0ea9d7bf81eac035cad0a3934f6b1613cea17c3b9
font_01_sfnt_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 10256 bytes
SHA-256: 6a97ae6c91d1ab7b0fdcf9b481f0bd659f107f4d39f1769a0d145009826a0923
font_02_sfnt_off000117f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.