Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4bb5c82cc041e9…

MALICIOUS

PDF

87.1 KB Created: 2021-09-16 11:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 15b02c2e4b1351792a0e1c6e9b461ebc SHA-1: 2987d01943b3d3ca1f6198e325afd15ae29519d2 SHA-256: cf4bb5c82cc041e93d49e4723813b12040330e8368d9dfb8b969e475cb0caaf3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the nature of the link farm and the heuristic firings point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://abimobiliare.pl/pliki/File/82460608087.pdf In PDF document text
    • http://www.pranabkumar.com/fckimages/file/vojerexur.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/modirepujugot.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/pelopifogobovirusugeba.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613002f7c05ec---sulofi.pdfIn PDF document text
    • http://htwy.com/upload/file/58239671572.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/62250554732.pdfIn PDF document text
    • https://irantruck.ir/data/file/nufenubexufuvu.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/34050877483.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/54400627494.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/tuwinojurafi.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/59843462133.pdfIn PDF document text
    • http://grimastone.ru/files/vetaxa.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133d84358bd6---nadaj.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/mesuba.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/54394240812.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/21281895571.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/pajupuku.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/92645938013.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///weritidilevu.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161407f404eff4---xefutidakaxekatedidanurid.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/38282803192.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/61254942839.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/legajaloxowudumawigeromu.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/42247093936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=poweramp+unlocker+apk+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD409 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_01_sfnt_off0000e998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 10596 bytes
SHA-256: 83dbf8d25a492bce9b25bc2354fb008b610491298c0f0c59f77f711f184f8ee4
font_03_sfnt_off000119e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E8 20044 bytes
SHA-256: 1096f05a2a454df7243678a33eacb43ff278afb247a94e15c603b120364265a8

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