Malicious PDF — malware analysis report

Static analysis result for SHA-256 d74c9db04190dea2…

MALICIOUS

PDF

72.2 KB Created: 2021-09-16 16:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3630893def6600aabba48edb4558d6a4 SHA-1: 1e7f2bac215e49ead079c0b128943298d8c015ab SHA-256: d74c9db04190dea2f6505e7ccf0446d92f61480a5673852af362419d440db022
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of these link farms suggests an attempt to obscure the final destination and evade detection, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/16ebc1885e81281a3b98484f0c31cc39/91171656146.pdf In PDF document text
    • http://alptw.com/images/files/26612358194.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/vimolisezojetifobowul.pdfIn PDF document text
    • https://freeunlock.com/uploads/file/83920442786.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/88127473051.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/ravati.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16130c4c77590b---datirunenawefob.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f3886ddec---wutikazidifav.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/51874157428.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f457381551---lidabude.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/39001036106.pdfIn PDF document text
    • http://consade.com/userfiles/file/bisolixidudajokesopakufo.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/zuxufumuturalatenina.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/nuzobobatozekafubakodas.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/jofixudowubir.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/48977093315.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/xumitarotaruvopa.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/2284924291.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///40223146036.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210912_022618.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/35252947611.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/sepubokogevaba.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/87406710153.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/9200063333.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/28569150941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=harry+potter+and+sorcerer%27s+stone+watch+online+freePDF 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_off0000b80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80B 16140 bytes
SHA-256: 2eda95dd3f180b32df9a7dec9162e6a71a6a68b1cbd0582736b2fcef1f8d3846
font_01_sfnt_off0000e164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 10944 bytes
SHA-256: 7afc2e77d496f6d05b465b976855e5cae82ec2092f0fe1c2116af79dd7629312
font_02_sfnt_off0000fac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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