Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd5c108a5b01884…

MALICIOUS

PDF

85.5 KB Created: 2021-08-18 10:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a6a4216634dffca5bbf531b66fa0a47 SHA-1: 845c5a08672a27465494180c350370e558994315 SHA-256: 6dd5c108a5b01884411188f9a371fd740c8d950485cf86366dc076b3fa06cd92
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to domains that appear to be used for hosting malicious files or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via a link farm. The presence of multiple links on potentially compromised or disposable hosting suggests an attempt to obscure the true destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://iscyber.com/userfiles/files/82987202980.pdf In PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/medofotekad.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/fufokobifenukarurifixisax.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/34369680377.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a22ee4724c---57995905197.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/8989706516.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/24901584655.pdfIn PDF document text
    • http://phpirateboosters.com/clients/867602/File/zilozogoxutudaner.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/c89e7a5484fcd7f7fa0e14bf39409da7/16217907126.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/kewupipadotapalu.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59c79c9053---80812229666.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/nimumetivodo.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/u6h4sad273jo2ualusfccpfs63/lofozigozadudafijixif.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/9e3c2c3989d11fbad4dcdc2c4c9e2f26/girajajekoreme.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/mojikaxaponi.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/79406933345.pdfIn PDF document text
    • http://mobitransjogja.com/files/96611393795.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/46390944071.pdfIn PDF document text
    • http://webs123.com/userfiles/file/zavijitarevutovox.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/9876cc16a1a0d286446f235065cb2bed/83821444927.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/37173482974.pdfIn PDF document text
    • http://firegallery.ru/img/upload/jifufep.pdfIn PDF document text
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/parirav.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/86573358609.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/zuzufugijamelodetar.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/32655391178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+create+a+budget+for+an+eventPDF 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_off0000eb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB78 10728 bytes
SHA-256: 581d8290b94e4cd4d9696f9ec5fb73b67d4320c4b077503bbc49e702392c3151
font_01_sfnt_off0001040a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040A 16628 bytes
SHA-256: ba9580e31023c75bdfb0672b8dee98a8290447bfaf5b818020913261e73aa1ee
font_02_sfnt_off00012edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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