Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce14fc52f3bab33…

MALICIOUS

PDF

84.5 KB Created: 2021-09-08 04:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 861ac1bc059471bc9e52b2410134281c SHA-1: 4fc2446c7bcc7cef1a3a1685863c407d8fa8eb5b SHA-256: 4ce14fc52f3bab33693ca0fd1dc170ac2cdc5acfafc7012e834fcbadbb8ed9bc
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites. The primary purpose seems to be redirecting users through these links, potentially to phishing pages or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/1b98518643170893fc193f4ed45595fe/80099759008.pdf In PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160892f869db0c---4725199382.pdfIn PDF document text
    • https://maisonforville.be/documents/file/47482197022.pdfIn PDF document text
    • https://robodom.si/files_vsebine/gudajowifutadudedo.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/liesklq7m6q7ih88gnadi0dion/46640560530.pdfIn PDF document text
    • http://msiutilities.biz/documents/99197252235.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/lufaparusorikugifudilojo.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/15679338602.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7049d01ba1---95007518020.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/9611053468.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f166e165fb---54068797071.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb81fb7b5e---zukukumewetukosewedasi.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/7926d939e02e732a50ecd04df30324c2/sigefuwuturapuwafi.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/97012244163.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/51635393979.pdfIn PDF document text
    • http://elskenecologie.nl/files/74100639800.pdfIn PDF document text
    • https://maria-galland.ru/files/file/91084211876.pdfIn PDF document text
    • http://techbis.pl/files/file/11843345654.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/gupaviroxelelawo.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/namejapisos.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/3a18fa55f8be530b9091f13b1cd88652/nelotenepil.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130147324b07---wudofukodanulaful.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=char+broil+electric+water+smoker+manualPDF 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_off0000e14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95F 19048 bytes
SHA-256: 17260370ed181b9a038d83f13d630be260171dd9a1160e15c1d717403ea8de2e
font_02_sfnt_off00012b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B21 10944 bytes
SHA-256: 923e710f3b542272116517a2f7bc5301146d6d2de3322d81281285c138e6d5b9

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