Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a5eab6fed295f9…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 02:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e64c93ace0f81d5f2a17e38031c06a4c SHA-1: 9b7566ee087f808794129dae47544238f9e153e1 SHA-256: 85a5eab6fed295f9565bba1489c1cb7ee65648fecc786c59b801d671c78f690f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.001 Process Injection T1204.002 Malicious Link

The PDF file was flagged as malicious by ClamAV and an ML classifier. Static analysis revealed multiple heuristics indicating a link farm structure, with URLs pointing to compromised CMS uploads and disposable hosting. The presence of numerous external URIs suggests an attempt to redirect the user to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://catamma.ru/uplcv?utm_term=arsenal+live+wallpaper+android PDF link annotation
    • http://babyindex.nl/images/uploads/sofubifaravaxegawax.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333509d5227---56614465810.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/purav.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/3743697777.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c37e782d1e19d4279b84173819b2446a/baxibisulu.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/fuxuvoviwopiwokozemitaren.pdfIn PDF document text
    • http://kmsenior.org/file/files/ziwusalo.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/28484471706.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/34889207706.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/towavifasiwaf.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/xofavi.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613346175db47---40236781390.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/69074596658.pdfIn PDF document text
    • http://paradoxine.com/upload/files/25884690024.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/19561292245.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/vevosexomifof.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/duduwisoligomavujebumuj.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/zawesamazerulu.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161370afb9748a---46917967502.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/pafasi.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/kotozoseberatokatube.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142e262b7b99---72126948975.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/lukapafiwevozanadeguguwip.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136260d1559c---82786854087.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/24714579438.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_off0000cc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC62 16444 bytes
SHA-256: 945463b46e977d5448cfa40545c0ebe09c84ee811774f9aad098b159766dd010
font_01_sfnt_off0000f6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0B 10420 bytes
SHA-256: 7b591e4775108a7d6738413714842c770ee2c7049d6d1a771c980d03c2adac6a

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