Malicious PDF — malware analysis report

Static analysis result for SHA-256 8976cbcbd37a2f67…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 14:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 140bb4a1b5fe83e99f54db690935e1ae SHA-1: 7772257953425cac416badf6950eeb33eac3d381 SHA-256: 8976cbcbd37a2f6706556b4a7dfc7d87745a10866e7e0a96d3ae3f1346eb31bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document's structure and URL patterns align with common tactics for luring victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://huntic.ru/uplcv?utm_term=circular+photo+app+android
    • http://hexindechem.com/upload/files/leliwud.pdf
    • http://labsshop.com/d/files/dogekopizamukidomaj.pdf
    • http://shiokuda1.com/contents/files/48691292651.pdf
    • http://lecieldesandes.fr/ckfinder/userfiles/files/81274826373.pdf
    • http://keralabiblesociety.com/fck_uploads/file/82370616621.pdf
    • https://dalton-english.com/userfiles/file/koparifuxatigajedodaki.pdf
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/20328905454.pdf
    • https://komunalno.vrgorac.hr/files/16014779561.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/161362f1ae4dd6---36229814547.pdf
    • https://eastmanllc.com/ckfinder/userfiles/files/86802445122.pdf
    • http://eot.mn/uploads/userfiles/files/72917820036.pdf
    • https://muachungbaohiem.com/uploads/userfiles/file/kogibunitena.pdf
    • http://infiniti.e-library.tw/uploads/files/1844524658.pdf
    • http://caopump.com/admin/userfiles/file/68731681598.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/b367d615d155abe9dddd58de24a5a87b/43698590368.pdf
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/fabizonitux.pdf
    • http://location-appartement-venise.com/italie_documents/files/94379789370.pdf
    • http://suliaok.com/v15/Upload/file/2021911524245352.pdf
    • http://khautrangkhangviet.com/upload/img/files/54468810639.pdf
    • http://deccanquest.com/konadnew/userfiles/file/38163634466.pdf
    • https://media-get.ru/userfiles/files/pumivotimalaxerizu.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161417284f09bd---78617020836.pdf
    • http://bulgankhangai.mn/userfiles/files/76842702346.pdf
    • http://canadianrockies.info/files/file/zudunanuxasesibebew.pdf
    • 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_off0000dab5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB5 16792 bytes
font_01_sfnt_off0000f2c7.bin
d547b70d8af5e0b3174528dd62bd976cbf82563bdd23d90b45a668c0f589b732
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C7 17376 bytes
font_02_sfnt_off00011fb1.bin
df21a180942df73b8bfd2730627e369d9dc8ff3bfa3c703cff7cc58941d5d78f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB1 10440 bytes