Malicious PDF — malware analysis report

Static analysis result for SHA-256 14fc39257df5ca35…

MALICIOUS

PDF

87.4 KB Created: 2021-07-01 15:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65fcf0c61e7c873e5d21a198a3b9b5f3 SHA-1: ed0a53f893e155545bf468f10a08d8764dec43f3 SHA-256: 14fc39257df5ca35ce8ac6329f1606875fc83d2f162a5f3d3ef04daf6bf17751
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classified as Pdf.Phishing.Trojan. The document body is unreadable, but the presence of many external links suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a629829a0f---gemunivige.pdf
    • http://cuahuyhoang.com/media/ftp/file/sabotirigowonosopimasude.pdf
    • https://sport-jicin.cz/dokumenty/93800826537.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45218b608e---48028658942.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/dbf7e7772c26676b24a06498ff7c5fcf/50665724379.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c512562cfd6---26015760594.pdf
    • http://valeneighbors.com/userimages/kowifome.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160a305b2df268---53208036418.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/2fmvibhn3e0i58harhglipqijn/bufekugofigujikifa.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/f8d1957d91399297ac0db0abdf4a6eb6/wokob.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/h6pote1qtrc4a2avd3rc7phbp0/98972022453.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/c0f814c70c528e4e516b64810c1c9c94/tejawudidamu.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/98a56e7e814022062d21a62e2c900e84/75576894711.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16099a3904deb6---18774395067.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/hu8pnje4korssftpoqst6ku4pt/67562913540.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/768e393b8c5d839b21b41f4168a8c5a1/janabasiselibipilu.pdf
    • http://sugarfree-gelato.com/upload/file/15846509280.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d722a8469---94417344995.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/8da4fc24d910122daf6d8491d81a789c/zupinoxon.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/th252d3hft467dd949tvhuh26k/farenekugurelivubulop.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160925cf3eb039---53986331508.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bc59f25e124---waxojamojufejujakam.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/i0lc6i21u97hs4n7p6sirv1003/42406059378.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/7d1d37a209dffbaea40d51ca619e5d47/zinerumalofeda.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=iv+dosage+calculations+practice+problems
    • 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_off0000ef4c.bin
3e805afc30f53d8fb18912342b21cbbc5f1778bf19f9237997701d11646c4635
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4C 11116 bytes
font_01_sfnt_off000108bf.bin
b455ac68dd9f40cfe0eaaaad496231f233e48a2f9502f281a37707363bf07273
pdf-font-stream PDF embedded font (sfnt) at offset 0x108BF 18056 bytes
font_02_sfnt_off000137dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x137DC 16792 bytes