Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f4516b3b487196…

MALICIOUS

PDF

70.1 KB Created: 2021-09-14 05:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 93ef78d94413937a80e97f7f24587b65 SHA-1: 4284b5ee9f15c92dbcc2ed06667894614e6d8ed1 SHA-256: c3f4516b3b487196100f34afb85d31db1333a33f790925a1edb0e37e436e2562
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, characteristic of a link farm used to distribute malicious content or phish for information. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://topoint.net/userfiles/fckFile/20210912220034.pdf In PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613f756ee97e6---53621375681.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/gifebevokamelubexiw.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/25224154044.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/51588044283.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109060921315742.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/8a0b496bb2bda4c1b395f47976d2091c/zexowewikejuje.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/megarevekorenaga.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/visonazadekozazenabajedo.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/jujosulajemutamu.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/womozuzabuxavula.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/86333604237.pdfIn PDF document text
    • https://sharenkon.com/files/5182495591.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/67429541445.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/c4ec4b9030b3d92dd91e3682f656f439/woxumakedudejive.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/8ce10np40cptrmf0eek3ul3ja5/wakaxaferuteligogeto.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/nodavojafanepurepaji.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/57506957952.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/fetanabagixaw.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/16850876255.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/3167981885.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=head+soccer+champions+leaguePDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/pikabijevug.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_off0000b2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D2 15496 bytes
SHA-256: b5b43230253465703c58691ae24424ed40a70fc2ee75474408fc0c9909796886
font_01_sfnt_off0000d9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CC 10956 bytes
SHA-256: d1c82528649fe733b9d1c088a6e0c6f50f01adf060630373f6d748ba67fcdd06
font_02_sfnt_off0000f2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1