Malicious PDF — malware analysis report

Static analysis result for SHA-256 968ad737f3f8def4…

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 16:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a7ee323fa835f2e2d5880e3166183341 SHA-1: f9ebe8f62a94c28bc5b38fc66fa96ab07f2da0f0 SHA-256: 968ad737f3f8def4c73ff53cfbbbb12740e349e1450d7168ce997490f955e9eb
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of numerous links, including those on disposable hosting, suggests an attempt to manipulate search engine results or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://jacsonsfurniture.com/userfiles/file/rotir.pdf In PDF document text
    • http://broadgatecapital.com/userfiles/file/somotozenitifetaguxulegaz.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-9/20210909180107390720.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/82920564750.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/85992251661.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/14792497736.pdfIn PDF document text
    • http://flomojapan.com/upload/files/14958371142.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c47ba8e3e5---80376119979.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612efad1aba76---56878609877.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/89028353338.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/fusezuxo.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/jobutuxeli.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/36550267240.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/nagabiw.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f807e3cfc5---16385435331.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/5686093934.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/13514542308.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/32937112772.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/raxoda.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/64340181168.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/fareso.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/doverixapavufu.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/duginufitatej.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/22487886666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=bloxburg+mod+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_off0000d781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD781 18860 bytes
SHA-256: b4cb0402770a4c7b6d1a6e8df5738d38648bee772280bfed287d91770291ea34
font_01_sfnt_off00010966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10966 10628 bytes
SHA-256: 56764879d37d000d9dd83444b3265ad36e95b54f67da4969e691532706dffc9a
font_02_sfnt_off00012152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12152 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1