Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55e013a70e0ed1e…

MALICIOUS

PDF

86.8 KB Created: 2021-07-03 03:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8955d021f884df9a2213e791d36cb1f8 SHA-1: d8c53a507124239a32e0a22a72ea39ddb26b13b2 SHA-256: a55e013a70e0ed1ef91a173679757acdb5b769b7bf9ce061d1987809de0f08e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised WordPress sites, directing users to download other PDFs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/8ra56od125cj3irj27smnju59k/92152346796.pdf
    • http://bioident.pl/photos_fck/file/tuwaxuvifotixeso.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/k8k6tt3q5qomcf0d0f9gtrkrpt/nupesabeduzupovo.pdf
    • http://koreaseals.com/ckfinder/userfiles/files/kitifetepuwaxajuvot.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086895bf10da---bozaxepo.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/4e8c736a91d80e7bb3bdcc22c573e703/93482968926.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083673e27f90---jitojifibelojetewej.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/36ca98913f57a4090ade74878e6c5d8e/mabekesaf.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2045fd7289f6728033cedf84f926e51e/6458512840.pdf
    • http://baugeraeteverleih.de/benutzerdateien/wuxomusafatufaxotamisiwo.pdf
    • http://adabaskimerkezi.com/upload/file/narafakemuditifemi.pdf
    • https://planet-for-events.de/userfiles/file/pedada.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16080917c96fb3---2439742856.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e7e142825---xaxazadekinoza.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/4676555c1cf9917ad202d2966133a5a3/vuvugarovubulagomidaz.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa2793b08f---96143916249.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160c911512c35e---20168681488.pdf
    • http://toonesk.com/upload/kemojoruzokenex.pdf
    • http://backkwang.com/userData/board/file/61225157801.pdf
    • https://walkandsmile.com/userfiles/file/41179485355.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce218a3e02---1747180974.pdf
    • http://currycornersugarland.com/admin/images/file/lupejawesumelemo.pdf
    • http://bocghedanang.com/media/ftp/file/tusiwikezopekibulew.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=loess+hills+scenic+byway+map
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed47.bin
2f4571bbfd0d388d9e70abf60ef403ba01367377ee15df4b104a7aa939782e2c
pdf-font-stream PDF embedded font (sfnt) at offset 0xED47 18092 bytes
font_01_sfnt_off00011c2c.bin
dccee5215c64737e9966dbfe3196b4aba1605deeb800b0a875904f9e55be1aa4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2C 10736 bytes
font_02_sfnt_off0001347f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1347F 16792 bytes