Malicious PDF — malware analysis report

Static analysis result for SHA-256 438b96feaba5e2c1…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 21:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 862bc55f3418389c9a226b845972476f SHA-1: 0465e43540c95743be4459ba9c75913e01fbc6bb SHA-256: 438b96feaba5e2c11857edfa1e9e48da3edd1c2b795c72d5fe98aa08cbc5361d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to domains that are either compromised or appear to be disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites via these embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://rzn-house.ru/upload/file/8008572096.pdf In PDF document text
    • http://runo34.ru/attachments/file/tajofaratoxo.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/kibuwuradejutel.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d4da44a92---78835455988.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210803083045.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3669db800f58fd5181290de6d739e95f/27899587214.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/makiket.pdfIn PDF document text
    • http://baoveantam.org/upload/files/zajokuzizafosawesog.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/gujaloxe.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/metowajo.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce51f77208---wanadegelikuvow.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/dajovironilone.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/64193612832.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/mepoliwami.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/6852848076.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/70387298502.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/porejebamubewifog.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/fekon.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/33b4ba060d5173fe0491b80a2488e49f/larifaxojaboxaba.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/25759423982.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/10524055955.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842bd162336---75968697168.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/1299730257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=inventario+de+intereses+vocacionales+pdfPDF 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_off0000e00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00B 10628 bytes
SHA-256: b73f0298808c3bb75bf02acef84fe644e30d3c1f89cdf24be620d562560d657a
font_01_sfnt_off0000f87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 19448 bytes
SHA-256: 67c9ebb9a6d08eb15fa289e402eb19dd5374ff9da69d3859364ede6231314aa9
font_02_sfnt_off000129bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1