Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58e9ed49f295627…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 18:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7084746d646cf244ab94f6099fe043b6 SHA-1: 4cd699da870524af8f906ae59a10a653db8d9615 SHA-256: a58e9ed49f2956270cccce1e869489d5acca3848bda13c23905483b7ded571fa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malware or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://bainihu.com/upfiles/editor/files/weruwasutol.pdf In PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825bf08d5ec---bimujuruzenifazuveloloj.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8cf255625---naxebigojumerovexibovorer.pdfIn PDF document text
    • http://cissi.it/userfiles/files/nanexafarodadegabafagurim.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/4de80efaebae14c5b3287f45a3c0bd6d/dufekaverutufesop.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/vazidiposagek.pdfIn PDF document text
    • https://dpmceramiche.it/file/genedubikalezolakoravi.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160fa219208405---zojazupejixorebejapufut.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/78304068188.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/47594233040.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210816081309159.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/ximamebine.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/15/file/20210515_215810_103.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607419b389f45---mikanawegaj.pdfIn PDF document text
    • http://elitvorota.ru/f/file/31437687354.pdfIn PDF document text
    • http://charivne.info/images/file/91250001399.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/koroz.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/ba2883487bf50be1e9048d83584cc7e7/33360069198.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd3ce13a33---bikorizakesewiserisexe.pdfIn PDF document text
    • https://badoza.net/userfiles/file/tulapujawuw.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/9be3743e2a96114305e5a548f0c5bc5d/79141714047.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/88401539272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=campus+board+training+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_off0000dbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF1 17116 bytes
SHA-256: ae8d20d9beb54f98c0ecfa160624f0b451533f65ccc49a3d8c24fefe87d6670a
font_01_sfnt_off00010814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10814 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001202b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202B 10932 bytes
SHA-256: 954d96d65b737d16e1c528698ed41c8d324f86b4e732c4a7aea5ab479428572b

Open this report in the interactive analyzer, or submit your own file for analysis.