Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9cee5ba2b54299e…

MALICIOUS

PDF

68.2 KB Created: 2021-10-01 02:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 693f63f292cca5eb150b631b5c043afc SHA-1: 0ea46b75d7f51c2af626d9db28bb22b94323fa44 SHA-256: c9cee5ba2b54299e1a5386b0c2f40a483b6cac449b8ff5890d2425bf0afd9fba
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress installations and algorithmically generated URLs, indicative of a link farm designed to redirect users. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the links suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crewmak.ru/uplcv?utm_term=where+do+i+find+cache+on+my+android+phone PDF link annotation
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161403329de3f7---nelow.pdfIn PDF document text
    • https://fobh.net/userfiles/files/13884113725.pdfIn PDF document text
    • https://venus-forever.com/image/files/namuposopegizoxovim.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/xawonatexa.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/nofesukepomej.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/gasazafawonodi.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/sufezapife.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/51108811262.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/keguwegakodufimito.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/c180c087cba6be60258628b876f7136c/sirorowidi.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/69253961247.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/sipekamotuwoti.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/40544179369.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/sogijewijigigufoneve.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/pezepi.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/posimubimisanekejane.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/13756061357.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/19385055334.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/zifuwax.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/7e7df7ceadaf3ccee936f652cfafa0d6/doxibewagovojirile.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436839a251a---91311404388.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/zokuwosagegofile.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/71856898298.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_off0000aef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF6 14424 bytes
SHA-256: b69047eb2f6dae3eca5bc76dc50e9961aff1cb062066630461784b2ef18ef72e
font_01_sfnt_off0000d309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD309 10680 bytes
SHA-256: 50ad2fd5c57805b90ce069677408ca7646d25d451b989669302830402d7a1809
font_02_sfnt_off0000eb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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