Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b97e480f1e7c23…

MALICIOUS

PDF

91.3 KB Created: 2021-07-01 00:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 516c79100ad5687594337ce063e48604 SHA-1: 137ade89d6b3c24e7ca1e447f4fe1cc99229b036 SHA-256: d0b97e480f1e7c23fc2395774872eb319e1559539ecfc614c8a6246c31d73994
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be the embedded links leading to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://alkanboya.com/files/file///fakewaseniga.pdf
    • http://domholidays.com/userfiles/file/fikutatasogig.pdf
    • https://clickkedai.com/userfiles/file/mader.pdf
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/ukmt59dgucj25ttvp8grng3svj/40676026963.pdf
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87888557967.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16217150209605.pdf
    • http://npi-management.org/ressource/site-image/files/jarujiro.pdf
    • https://boucherienabli.com/uploads/FCK_files/file/futazadodibuliro.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a634975e572---fotowuwuxemo.pdf
    • https://rdsdealers.com/ckfinder/userfiles/files/86333489896.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51c529a7c3---vidabeza.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9cd0c777b---xilatevosegevajoze.pdf
    • http://armanetti.com/images/sipogagoxegevalapupu.pdf
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/76535655095.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/2c5ad820e0459babbc0c16411e9e3b90/kefexiloserila.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607046aa457e2---fekik.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d237fe0db8---58099999747.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/b5e489b794fc35b8782b76e9949e55de/68432202629.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a816611fb60---16295889697.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/b8f14264097260bf943991565134ab6d/53177139509.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608456c7c8a0f---10741231713.pdf
    • https://artlabjo.com/userfiles/file/xabup.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/5g4fffp3l9utclg3in5rrp7tm1/nawupomevogenanavinuridan.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721f3595c53---jefixoluligowag.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c4e810d5b45ebd1f8a17560dcc66b6f5/23110596475.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/a1076b284fd785be2a35d9c9d688702a/64205547675.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=general+anesthesia+propofol
    • 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_off000100b7.bin
9d020d4ab35a79456b05bef742c5b17882cfdaaf993b2e94d481c54d5bf75e63
pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 18452 bytes
font_01_sfnt_off00013013.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13013 16792 bytes
font_02_sfnt_off0001482a.bin
abe2343f3c35a2f252adf5feb08e931f28602b903c5bf0013c16a6533c333594
pdf-font-stream PDF embedded font (sfnt) at offset 0x1482A 10492 bytes