Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f8f4b30868effc…

MALICIOUS

PDF

84.1 KB Created: 2021-06-25 21:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0bb5496fc24848294abc7d0249b98e3 SHA-1: 5d1eac06450974ce80a762384c032b4e9642c08b SHA-256: 36f8f4b30868effc8fbcbe77562b3c1d5830293f91829089baed56d1cbcb1ec6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites and potentially disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple external URIs and the overall structure indicate an attempt to lead users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://romanakladatelstvi.cz/userfiles/file/86719237606.pdf
    • http://jarosi.hu/files/file/73007265655.pdf
    • https://motelandratecuci.ro/userfiles/file/bukofoxanenadelamomobifov.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/ad5be92bb2d854036da4e4473e650693/35863199441.pdf
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/pifufakovov.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5655adf385---robubevefixadimanerodiga.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/khp09dupm161ttaff4mqvq447c/4743972951.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085b37d90cf8---nimurazu.pdf
    • https://yildizwebpaket.com/calisma2/files/uploads/78792690635.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/6d46f43eedef82cb6e0f7d74b578795c/pezazovokapebapetaran.pdf
    • https://ludifrance.fr/userfiles/file/19762936615.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca47326c39---mezugigerono.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8f567a883---9917743125.pdf
    • http://musikpark-live.de/userfiles/file/4250027584.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/m7v2fhimlvr261a8bfofo914o6/30538956820.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb58981f1bf---4816343261.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/phvgvffo2oh4ce6hjs9dglepeo/61737040434.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/17c6ed96aa1afc17eb9973e330166645/932003894.pdf
    • https://olivierdaulte.com/ckfinder/userfiles/files/70181168389.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/2af9f78cdd748d7c340ce76d2f8934ac/lubopemesomufafajim.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=best+toys+for+lesbian+couples
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e282.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE282 16792 bytes
font_01_sfnt_off0000fa99.bin
c860b339a6b2c2845d22c9fb24cefaa3095cf473874c8750965e6a58913f7082
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA99 10880 bytes
font_02_sfnt_off000113bd.bin
209587614c9872f90baa92934a4d93330576639beb2be0e760b09d3121ddcd58
pdf-font-stream PDF embedded font (sfnt) at offset 0x113BD 17820 bytes