Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1598c5eb868f58e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-16 02:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8b6d6861ac6beb5b60a2b29a24fe2a62 SHA-1: 8d9491fac4a1cf642c48b98a3679f26245aff78f SHA-256: a1598c5eb868f58ea474bb083bebf1c75c924e4a01b809f379e100589570143b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=mxq+pro+4k+connected+to+wifi+but+no+internet PDF link annotation
    • https://jokerprod.net/userfiles/file/vudipumum.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210912045106302725.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/lifido.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/tofetapabamunamowapuke.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/27579499658.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/18492100837.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/bigiwizosufipatug.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/eb6eb41926869dd12db25c11cf90d9bf/nogifebikav.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/dexerixelimusovunu.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/desisevuvapejojotuzi.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/wubupiwenikasomowoxa.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/ba682aa84f4314066ae9ff04cc750936/fawetogu.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef648c40c6---lifutepi.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/fafotumijijuwukapagenep.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/80658221628.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///lujimevodoguwupinegusa.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/36561985713.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/vagedosolafogepiwebovizu.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/nuzol.pdfIn PDF document text
    • http://citty.org/images/uploads/file/tetibowadetomejananuv.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/lovepif.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/diwoladaxokopatozalari.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/lalijawebupoxalofilagajid.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_off0000df1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1E 10976 bytes
SHA-256: 60e85899607ac2e6140cb41aa00030fb7b10070b47e8684118752bb76678e38e
font_01_sfnt_off0000f859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF859 18060 bytes
SHA-256: 4b84eaf08655f18dcbc0e393e382f82c8f7dd3bb09b99ff932264c220e1ab571
font_02_sfnt_off000126c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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