Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2d4be5144debea…

MALICIOUS

PDF

73.5 KB Created: 2021-09-08 09:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 137d7518e934574b3370377d8db3b91f SHA-1: a8008e0b7ffdfb7f834ec02c713a00996fe82703 SHA-256: ca2d4be5144debeaa697cdf988e76b40a43a645118e4de8af26f9f010b9d7a3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's used to distribute further malicious content or phish users. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://wsp.pl/userfiles/file/vifudemarokowawileravijum.pdf In PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/19928ebbac104ed3fec749ecac5e1beb/87646304377.pdfIn PDF document text
    • http://thedreams.cz/files/vigadupuvemasedepex.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41ad21150---91803956099.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/74849402212.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/342dc879ad4f8f2d2099870aed9a6cd9/9101613526.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772e4857a73---bojudabigigibatavotepedus.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/c2270fh77haa9mvm3lgipfmbg6/gaxulugomizunuto.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/pififomawujatuwifut.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/15440ed54328e209567b6bfaf7378f92/fojekijerotipigu.pdfIn PDF document text
    • http://www.heksan.com.pl/file/29198629642.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/4e05a78240db97b5618c728203fe21fb/20751922893.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/durorivobavowasofaziruda.pdfIn PDF document text
    • http://lulanjina.net/upload/files/93504512462.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/wimofutuwikununuvizuwi.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f745e4e05---kenebiwilaguraduzovuza.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/2329241939.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160fb447d73003---reripolejozemovikirix.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d968607b2d---82438597312.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/xukotobupot.pdfIn PDF document text
    • http://fvhs1970.com/clients/876770/File/wewurofunonaw.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/b2af8af833a6b00c344cff60a1911f61/50779940996.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2eb8baa91---lovaj.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/54016834359.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/31847327028.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210830224326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=food+allergen+list+pdfPDF link annotation
    • 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_off0000bbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F4 10652 bytes
SHA-256: dc38fed3b2610bba8e4c92d934a2bcfae95eaf9e995233dd8a232bdbdbe1d8cc
font_02_sfnt_off0000ec2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2B 16784 bytes
SHA-256: 08aecba94530c1a3cde28d0738e503868b110ce124925acaffd3faf70105ffeb