Malicious PDF — malware analysis report

Static analysis result for SHA-256 5507b1425f017495…

MALICIOUS

PDF

94.3 KB Created: 2021-07-19 02:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 138e8c9f2023e71ace381f0932b3961c SHA-1: 7f4dccb2277c7b8957ad20e8981bf84a24443f24 SHA-256: 5507b1425f017495b4773f0dc76c562f2b49f00f025192b4b1c5cdc47ff3e333
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure indicate an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://global-insurance-broker.de/downloads/zegibexuxazunesirumiva.pdf
    • https://777mto.org/contents//files/10095188232.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7d320cd95---memulazexunotoxev.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/n0ucrmljso8tr96b5fbn92d712/56682445586.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160affd9b69a48---37837339327.pdf
    • https://sitpchemcieszyn.pl/_sitpchem/file/pixefajijosataguda.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7d73689a5---belede.pdf
    • http://kiszelyugyvediiroda.hu/docs/file/fasupitafa.pdf
    • https://aarhuskortet.dk/images/file/79660438299.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160723e1e9ec7b---magatemegaforosazedofevu.pdf
    • http://geneolock.com/locktactyuma/userfiles/file/minenutubifilusi.pdf
    • http://toonesk.com/upload/lugotefoxux.pdf
    • http://cmuniontravel.com/userfiles/files/60456881324.pdf
    • https://mimpishio1bet.com/contents//files/xevulogi.pdf
    • http://zhengfutz.com/v15/Upload/file/2021652221366500.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2e3114342---83623472041.pdf
    • http://feuerwehrobrigheim.de/upload/files/semiguxetagisuripobozi.pdf
    • http://iccjsc.com/images/uploads/files/27859653421.pdf
    • https://cabsfromheathrow.com/userfiles/file/teboralisa.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/9c620c9c97b9c47450a92289949e8896/15602793033.pdf
    • http://zxsolar.com/d/files/nosizejaru.pdf
    • http://onellenorzes.com/uploads/files/62007767040.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc2806393e---97012789440.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/4d4d1e7b7987eb1583cdb41167d0dc8c/noden.pdf
    • http://ustunongel.com/image/files/xabuj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=a+first+course+in+mechanics+mary+lunn+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_off00010b56.bin
44b51312ac05ebe495af2df8873707535a9956f036cc79d3053e72ec4704e914
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B56 17944 bytes
font_01_sfnt_off000139fc.bin
ac1707882517ea5df706eb8edf465f4e49afbc5e90899281accd8433b3fefe75
pdf-font-stream PDF embedded font (sfnt) at offset 0x139FC 11080 bytes
font_02_sfnt_off000153ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x153AB 16792 bytes