Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a10038f29edde2e…

MALICIOUS

PDF

81.9 KB Created: 2021-08-11 22:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 749e404e2e533580ceeab6be45691908 SHA-1: 19e620f74dcbd29e4ea200bbb5841f4a3753919f SHA-256: 2a10038f29edde2ebf746db0b7d7e28dd531d96eb60571146323aa85b1476a07
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the primary attack pattern relies on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://philabc.ru/uplcv?utm_term=bear+robot+car+transformation+flying+car+robot+games+mod+apk PDF link annotation
    • http://taikenplan.jp/ckfinder/userfiles/files/10275576124.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6b3dd9411---fosumusisujexigu.pdfIn PDF document text
    • https://p87.hu/files/72580171413.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/84731631390.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/lesumanilawoxatazufifope.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cebce2555b8---noxamilexezeturupodo.pdfIn PDF document text
    • https://menu2uplus.com/images/file/xuwujagalomovuvexa.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/57348927528.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/72681391363.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/2f13206b8c9ba4a61081cf7e7860c9a3/kexugivugafutevifibax.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/pka7kb5gd0sbujl4u8s22rp5qa/39064821190.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/54724161299.pdfIn PDF document text
    • http://iwishop.hu/file/kafafujagiwog.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/27831279718.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160740fd046fba---xuwazafukobefoxosunuzaras.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160766adce4a90---dimojogerebajulosaso.pdfIn PDF document text
    • http://jarosi.hu/files/file/57008604238.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/1fb7ab025596521aa71a0b457ad0f2c4/liroxirawewik.pdfIn PDF document text
    • http://policylic.com/uploads/files/ruwiposumakogivuzevader.pdfIn PDF document text
    • http://matras-devison.com/upload/file/wubizapavigawifu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2faa79b2ce---nazerujixugitek.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f2bd0360d2c---75138214837.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/fisojodalasut.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_off0000db0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 16472 bytes
SHA-256: 61f2d14081276d5d44d1c9167ca248c76a1e0636ece7706e111d296010be0422
font_02_sfnt_off00011df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF5 11360 bytes
SHA-256: 7b8983dc5fa6ba09d4b4cc8794d19af9728d294978a5bca3304eb2f642059470

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