Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3ee69534c99b8a…

MALICIOUS

PDF

80.0 KB Created: 2021-08-21 15:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 98ccad1ac3510b4295a44a3d626914ef SHA-1: e0201cd4ced769d9f643cbcce517b79eea40cc69 SHA-256: 8a3ee69534c99b8ace9102858ffd17fc82dafc284e95231cba78a12fb3b1a2de
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or are hosted on disposable domains, indicating a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://olech-rzeszow.pl/userfiles/file/68569307632.pdf In PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021052319033873499.pdfIn PDF document text
    • https://istanajp2.com/contents//files/pixenasabajavokobofage.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/79520502920.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/vidozowelu.pdfIn PDF document text
    • https://marosme.ro/hirek/file/zakibebeditowatunefata.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/fasaf.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/dedagodibifavugorimunu.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/ganoxaxazisid.pdfIn PDF document text
    • https://mmszke.hu/files/file/77854049670.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/fejovozoxuwif.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/31ee9239e6f06302cc44ca39787cbd0f/76709408635.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/f701a979210f50e9b037230da7fc88a2/menoka.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/51206845415.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/21419475047.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607017146893b---86541195744.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/sosisam.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/e3bf87091ad83885efd63bc6c11322af/32354348330.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160be4e7042fff---52491493297.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210818010317.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/01en4iodvfse7bjm6e0tmsmobn/56314861012.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/99357239089.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/26034509760d9a553acb16.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/zupelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=what+are+the+main+parts+of+autonomous+carPDF 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_off0000d73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73C 16224 bytes
SHA-256: 7130d7832324051ab16feb37bfa918608b8999624fa76f666e9e3df25a7d7191
font_01_sfnt_off0001013a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013A 10792 bytes
SHA-256: 40738e9a161f92386306a097d7783627277a2640ee40b420bc5864ec025744a9
font_02_sfnt_off000119f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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