Malicious PDF — malware analysis report

Static analysis result for SHA-256 07f90da0808ca2ed…

MALICIOUS

PDF

89.6 KB Created: 2021-09-11 19:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 015e8930e08745f9fa070acd776bd10f SHA-1: 1d32874bb76faf1ddc2f1d4bf90d3fc2b2218753 SHA-256: 07f90da0808ca2ed6c220355819cee5410c507bc4d01ea46ed9f1c47adda490b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, designed to trick users into downloading further malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://intertribo.sk/files/5153176524.pdf
    • https://cncostruzioni.com/userfiles/file/pagunadimipexesabavoboli.pdf
    • http://sosonomo.com/ckfinder/userfiles/files/95832235241.pdf
    • http://hexindechem.com/upload/files/samutosazuku.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/l182go6lisph9ipc0j0jrqh0t4/nafofikowatefim.pdf
    • http://ichieh.tw/uploads/files/202109080613112498.pdf
    • http://nriloan.jctoursandtravels.in/files/nozatokib.pdf
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/15134983504.pdf
    • http://saktigroup.in/uploads/feduwijovoxa.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c770b816b2---97799282702.pdf
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/44203493957.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/8516a3f27935908ec9b6ad74847f756c/31085344403.pdf
    • https://siriusdynamics.com/assets/uploads/files/jadawofepulufuzobuw.pdf
    • https://cleartunemonitors.com/ckfinder/userfiles/files/85768648184.pdf
    • http://chizclean.ru/files/fck/file/56588983044.pdf
    • https://manualismedicina.hu/fileok/file/lesozeg.pdf
    • http://mutitar.com/user_img/files/jagedinalewixojukoju.pdf
    • http://carraracucinecomponibilitrapani.it/userfiles/files/dekujoxagujelid.pdf
    • https://keongracun.org/contents/files/59764004590.pdf
    • http://otestmanager.com/club/data/userfiles/file/20210901215237.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c12c907838e539e1d41b0f50f0eadf1/polomiluxajaxazaxekesutug.pdf
    • http://vitajeans.com/ckfinder/userfiles/files/69017924343.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+enable+dark+mode+in+redmi+5a
    • 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_off0000f8cd.bin
09dcbfe03877ce744ea9804bea32bc5b5503dbed20ae3d94afe98181bac9fb13
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CD 18292 bytes
font_01_sfnt_off000127c0.bin
d930d13497cf2cba541a5ad3976103ebb82dd62aa45cc83cdeaddb0fb726b859
pdf-font-stream PDF embedded font (sfnt) at offset 0x127C0 10684 bytes
font_02_sfnt_off00014043.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14043 16792 bytes