Malicious PDF — malware analysis report

Static analysis result for SHA-256 f852fe92823f446a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 02:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9621f50cc0a77160459d34690ddd3ee1 SHA-1: 7246ce2412e270a2204f6311d58b1f56e589ee2c SHA-256: f852fe92823f446a3499b2dff73a3828288b1af40b098011e751c0a3d58361b5
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS upload storage. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL targets suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://consade.com/userfiles/file/botaxisiwakafuxezepik.pdf In PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/42232602578.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/gisadiwi.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/86697964422.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/sesomiregij.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/30617848998.pdfIn PDF document text
    • http://vucert.vn/uploads/files/midozedazenelibalimasufu.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/zumimimezat.pdfIn PDF document text
    • https://thepainter.asia/upload/files/guxavugizololedaburuzevo.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/mevemabatavamuratute.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/8219220802.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/som92f7q5itslth8ir8isnmrni/forugebujutu.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161440914c00ff---domakuleluno.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/b1n3j9bqckfs9bbg4t5u497nul/10207006607.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/42351520070.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161487ba79c190---forur.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/58815372868.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/muvogifowadeketepapive.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/biduxelaper.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/68341063691.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/xunokudo.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/berolopamoxowire.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/56510385071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+do+i+block+websites+on+androidPDF 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_off0000dd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD18 17424 bytes
SHA-256: 1b78454ad1f93fb39ad31db5f5415f7bcb3460448832e7160881e7c712b9dbf0
font_01_sfnt_off00010a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001226a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226A 10672 bytes
SHA-256: 0454bf96dc0e0f612a0cb2b6fd3d8870ffd20ed281dc42fb7fe6fcba3410ce05

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