Malicious PDF — malware analysis report

Static analysis result for SHA-256 045da7b922ad22c2…

MALICIOUS

PDF

79.1 KB Created: 2021-09-03 20:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0859cdad682a9c108e2c0b7920f6ded3 SHA-1: 7839ec3f7bfc8d204627823ed2572c6c5c489246 SHA-256: 045da7b922ad22c2cb3f09863f03dadaa479ea746b655a7e9fb0420464de4e68
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These links are likely intended to lead victims to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://krisoc.ru/uplcv?utm_term=que+es+fauna+silvestre+pdf PDF link annotation
    • http://momsystem.ru/public/file/33659006642.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/91182677616.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/17916035719.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/folokapuvefod.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/tujelevewidu.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/93669069511.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/temosexotiwa.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d250e99d36---gutazudizifepa.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160954617bed0d---62467640821.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbfd370cdc---gezalofelat.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/bupiliverad.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/4e26ca972c246f5ef6b471436d2905f3/gekawuwivoxoligajug.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/57374202675.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ruwegi.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/sokivugekumuzar.pdfIn PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/92058131163.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/29522373802.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/nexatavukesewuzanobi.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/60e3aac590313d57388ffa58cc24f8b6.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/xixodusofekedolis.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/rdncp2nq05bne9s258p8n1mog0/1485977635.pdfIn PDF document text
    • 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_off0000ce82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE699 10596 bytes
SHA-256: 037dddc978336fa6a4a4f9965a575b7e3689cde84d6bdeaf7122fdb414e6c251
font_02_sfnt_off0000ff0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0F 18488 bytes
SHA-256: b3d9b0fd335a1373047a0b2399cb6279257f91969e9de77f02c2a8d5ef31d594