Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba1d8da84c5e0f2b…

MALICIOUS

PDF

89.6 KB Created: 2021-07-31 04:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 74dc4ee169de3f65738914665a538e4b SHA-1: 3353b029ad5ac0f792e59c472b0a96c56da6e9e8 SHA-256: ba1d8da84c5e0f2b082865610617a1893f788276e73b7af9e26b97e8d22f4eeb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of link farms on disposable hosting and compromised CMS uploads suggests a tactic to obscure the ultimate destination, likely a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4aa5300df---17506611868.pdf In PDF document text
    • http://springbook.no/files/83850045112.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/bh888r6h6apjjfltmumsji8bg2/zipigi.pdfIn PDF document text
    • https://digireg.ch/upload/turajopumarefiwofawa.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/748d1a89ad16c74a459c664a70f1d745/diropug.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e48e4985261---fopijudokajawezenomokepo.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608336b5c4b3d---fezefolevorarepi.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/68702f0529d4269f69dd4a3d4b6c0960/57135758105.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/kevijojabatamedimavop.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/murejoko.pdfIn PDF document text
    • http://accronline.com/userfiles/file/42273905540.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/7f6ikma8shfkanmcf4kp4qm1p4/gepemavujozoluzedokovana.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/fimogaranopidaxavupi.pdfIn PDF document text
    • http://kodcomputers.ro/2664/uploads/11055251630.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/93215227839.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/70311499391.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/69384193118.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/20492649676.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/5f56af8bdacd4934d668877a96801d99/vomifonitefesolipafajeref.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/5os0t08aqkboi3hu949vem6bs1/9191311225.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/2317859834.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae83a22f77---masafe.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/1ce12d4cd3c13a3a017dba749e762ec1/gawufixavefonugup.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/52432580221.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/datoketip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=samsung+family+hub+fridge+ice+maker+not+workingPDF 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_off0000f75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75A 16872 bytes
SHA-256: df9cca51186a83e030fa22b34274471640cdbf66866a415f0e84d882d7d45880
font_01_sfnt_off00012312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12312 11528 bytes
SHA-256: 8f156972df627ee894c1efd507a4c0eaa4122f7baa4507ad64396013026801c9
font_02_sfnt_off00013e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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