Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5a09f9fa29fa4a…

MALICIOUS

PDF

76.2 KB Created: 2021-09-24 08:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f8dd037620de2e8f57352a02ea33b998 SHA-1: e490b30c9059f833ad33671e9c8e3e6c2db781d7 SHA-256: 8d5a09f9fa29fa4adaaf20da60436a52b884d93f16374dd33a31e919e253e87d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites. Several of these URLs lead to compromised CMS upload directories, suggesting an attempt to host or distribute malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=carrom+board+hack+apk+download PDF link annotation
    • http://esipro.lu/userfiles/file/sizulofe.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/37108105904.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/28675852374.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/75492488408.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6cc30a77b---37244724395.pdfIn PDF document text
    • http://ciskmv.com/css/file/moledegegimukekom.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210919_F9ED0B3A0341DF43.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/manefopeminet.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/1661361822.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/zopubexefizak.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/56489408660.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392f2213669---tatavujozekolejet.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/73779303311.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c6afdd011a---xuvupifaratogewawetud.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/varedaj.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/ziranavix.pdfIn PDF document text
    • http://mgrima.com/files/file/vevunaviv.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16148c299b5a43---13486689854.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/nikoni.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/fozipobigesivuno.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/nabotugokilaboj.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/13036199327.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/xobat.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/rarafasebodexovabogif.pdfIn PDF document text
    • https://digireg.cz/upload/mejunetisaku.pdfIn PDF document text
    • 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_off0000bfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA9 19884 bytes
SHA-256: 7c798e16fa381025def09e2495fdd62816a945df0b913620bb148cdcb0afd47f
font_01_sfnt_off0000f2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AD 10640 bytes
SHA-256: f38bbb0de8768d2c9fc51b19a7fc35f8422e438f266b8c607b0cb5aa518ffb41
font_02_sfnt_off00010aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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