Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da6764379651ed4…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 19:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e7168fc38a84f72df6b4910109fe43dd SHA-1: 0a33fa693e9f974e25878df8da574752d706f6c4 SHA-256: 9da6764379651ed49e512d9c7928ff70022b71b5e4cae2e3a3f2b26eefa46aee
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of a link farm and external URIs points towards a malicious link distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/linifod.pdf In PDF document text
    • http://internet-trade.eu/UserFiles/file/78894002579.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/71016615460.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/88485777918.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/sakixoxejutumegonikofopif.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/sepobafokil.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/99524856221.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/45818888034.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134426d8a48f---57747869626.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/mobobifunofate.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/31171559969.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/sukimafosudono.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/bunalazuxo.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/93628360843.pdfIn PDF document text
    • https://subarini.ro/mm/file/difolakukaw.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/jatedinunizeguwawo.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/45215338267.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378c8cd8d6b---jipowubinefuwowapid.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd98aeb9a4---todogutegik.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/tuduv.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210906_E3C106C9E6C34273.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/84910724092.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/92110095027.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/85447985944.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/sidebatazik.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/xexujajepakukaperipovut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cbr+to+pdf+converter+apkPDF 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_off0000daa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 17620 bytes
SHA-256: 07bb32c8401b8b2feca3b3c3cacb59d0d96138b4e39f733dc6750cddd253a561
font_01_sfnt_off0001085c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12073 10636 bytes
SHA-256: f36390bac86da4fe98def3cf87879664aa95ce5dca58bca9aed73e272f7527d4