Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc9991ff33a27b9…

MALICIOUS

PDF

90.1 KB Created: 2021-07-09 19:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9c9a19fd795d28dbf9052f5f1053ea3 SHA-1: dd93712e35379d1d4f083d2967142ddeb3167a63 SHA-256: bfc9991ff33a27b9ffcca9ddf5a514f44f3f1410e7780a15e1f4050e41855164
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and potentially disposable domains. The primary purpose appears to be directing users to external resources, likely for malicious activities such as credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://philabc.ru/uplcv?utm_term=dirty+blonde+with+red+highlights
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160756fdd84cd1---juzibagitikusobubikisuvo.pdf
    • http://verduciautodemolizioni.it/userfiles/file/36090370838.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16091004ff18b5---funuxujuliwovuwusebupo.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d7db900e8---47048164234.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/2s795pca6etb32hp66ar9qhrac/74635259409.pdf
    • http://promocode.lu/userfiles/files/27335601412.pdf
    • http://adirondackseafood.com/ckfinder/userfiles/files/40855948292.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/9047f6c1859223702c5997ea8ee4afa6/14721296439.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093a9eb1a9aa---dowisilimanikedivowodig.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608d99e2568f7---tusomakokufapevesiwow.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/2ee67a58cdee3e82c0d0220a65e8ef9d/12209682935.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160734940628c7---pokoderovanologax.pdf
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/rinim.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/hu78e1inqo18iv2shustvn49u0/puvujutepida.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac901f2db45---42989513178.pdf
    • http://www.cerathai.com/image/upload/File/sirupojodizudunagageviso.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ubmn346pshcis973gs3cu7n431/dewuxuburalewo.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e24d80a8907---mazosutovadev.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b361048ce7e---sokemuzefenononewefexun.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/7dcf4471c4978b00f8a2eee2f3668a5b/73956271303.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/16fc2e383673c1af049a1f5b85bc7c2d/novizepu.pdf
    • http://amirafouad.com/uploaded_files/file/kapoturubev.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/6fbec5996ad06a4692c3c8cb0de873f3/18832743406.pdf
    • http://all-pass.com/folder/editor/file/58528333652.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/53185279729.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_off0000ff71.bin
30580d7b385d4560046044b9dd8f5e834403de6d08f80bf08e021e4b93af109d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF71 16624 bytes
font_01_sfnt_off00012ab6.bin
ee21b2821f43954050aa5dee593cc42bd8132a84627c53455ac79bcad1531ca8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB6 10704 bytes
font_02_sfnt_off0001430b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1430B 16792 bytes

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