Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8ca98dca9c09c2…

MALICIOUS

PDF

74.3 KB Created: 2021-09-25 00:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9733450fd0ec804a030e6971bf3f1b24 SHA-1: de0a32ba2537effc8e2a2441193cc9c464441821 SHA-256: ad8ca98dca9c09c25eabc00e34394d14d086daf1740bc643ec4ac72b64ecfb16
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://oniceh.ru/uplcv?utm_term=filosofia+nahuatl+pdf PDF link annotation
    • http://pattarasawat.com/ckfinder/userfiles/files/43214820327.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/naweture.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/nineme.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161461a04a493d---zelogegililijikezokedofok.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/40778522811.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/pibevumogegevuginaza.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/52548549173.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161495e3ec6754---laxosuvipo.pdfIn PDF document text
    • http://zerosquareonline.com/file/26802854368.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/27374243760.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/fagenaxaluf.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/pazijonogeraxoravefodalaw.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/kokudevapup.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/5900870268.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/kamon.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/57975151857.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/30590354140.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132e4f0af28a---womirosoluzemapazuxow.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/65299904464.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/wulafebakipodokatoga.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c9443b197---rimopisemunitajewulen.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/199e06cbfd7de2f20025e77d382aeb9c/66252607069.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/zarujezarosodo.pdfIn PDF document text
    • https://interconformity.ro/images/file/todepu.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/70268016824.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_off0000bb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB79 10440 bytes
SHA-256: b3248c7f17b7931c9a9b7e0f8fdd7d5fa4856aa12c92f21b47b3538909082167
font_01_sfnt_off0000d302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 18744 bytes
SHA-256: 6b888c19bd940c6a46188fea111fbbad9bf8330f4ad79062441fc1ae5bd81838