Malicious PDF — malware analysis report

Static analysis result for SHA-256 62337b16b0dc7a45…

MALICIOUS

PDF

126.7 KB Created: 2021-09-06 19:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bef85e9ac3fc8a50c83a35f9dbb85bdb SHA-1: 8fbb6abd843dc196d481a5a2d986d86733a5ba1d SHA-256: 62337b16b0dc7a458ad5d34173c3e1347dbc2ddf424bcc42b33f62f29d18fd4a
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The PDF's structure and the presence of external links suggest it's used as a lure, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://nepalihemp.com/ckfinder/userfiles/files/bewewamakoriwupetoz.pdf In PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/8846261841.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/56893358798.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/bd1d20026ece438851a27296347c2094/19738386892.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/golis.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/ralugigegago.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/vojefowomonozamowitimo.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f7999165a08---17000423340.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c69c7ed2054---zawapir.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/gikogomab.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/07/202107250753187754.pdfIn PDF document text
    • https://sealskinz.ru/files/file/pusesisotulejan.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/44132980803.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/25109947411.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/91d758227dd6eed2fcce9f8dcefbb4e1/dotevomawo.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/95633273624.pdfIn PDF document text
    • http://ewtch.com/upload/files/dezufiderateg.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/podurobiwefunofuguwukej.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8787424851.pdfIn PDF document text
    • http://ecole.ru/text/images/file/62728093063.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/ee8qgb59po86g9eisd0cmatvps1fsoc3/12785077528.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/gatub.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/3b7fe40e7e918d3fc185fc02e7f7f05b/miwagubame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=schiit+modi+3+user+manualPDF 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_off00018632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18632 20316 bytes
SHA-256: 77bc1fe058cecfccc41a0c4ee71447c446e4df39985fd73fd46f9cbd7f84f0ec
font_01_sfnt_off0001bbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBBB 10984 bytes
SHA-256: c52d9fe247d69057a55543654c82b45d78120297ff43fa374f249558c98650ab
font_02_sfnt_off0001d50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D50F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1