Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd503078564edf45…

MALICIOUS

PDF

81.7 KB Created: 2021-09-10 14:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8bbd92f610f9e862f071ebe6babcf0ca SHA-1: 84020e43a7fa885c6ea2447216c80a968637f796 SHA-256: fd503078564edf450bd85e67ef00782a32622db57a1ec01eed40ff38272dede8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download' button lure further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alkoplast.rs/files/remeson.pdf In PDF document text
    • https://agros.net/uploads/file/bewipinonad.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/zotofabegirowazi.pdfIn PDF document text
    • https://onlinendttraining.com/files/14509597420.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139f7694bd27---bekun.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613027a5c9496---vipufu.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/safokopudidexez.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d26d28e98---53905285696.pdfIn PDF document text
    • http://hiniceshine.com/upload/fuxixiw.pdfIn PDF document text
    • http://signauction.net/userfiles/file/98063373151.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/kodozosisu.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/dipitakijibasevufikabiwa.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/86699405379.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/82297672167.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/10249303290.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/zuzisiwamikumajowum.pdfIn PDF document text
    • http://wdnederland.nl/file/22782235802.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/85787667634.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210904_AE114A9711A1B396.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/85993798279.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/35107311826.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/49310237048.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/14d0e9b717f372e67dda9f35927fddaf/xarufixiradul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+download+mobdro+on+a+smart+tvPDF 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_off0000dbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD6 17896 bytes
SHA-256: 087e1b0c68005cccba1e449dd0d30f05dfda5a287325e3220f5c012df99de9cc
font_01_sfnt_off000109ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C3 10468 bytes
SHA-256: 4700eb5556ad793c5365ac421de95095dce5e22cdcea63ae4719c9da8a22660e

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