Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ec06614c6117254…

MALICIOUS

PDF

83.3 KB Created: 2021-06-29 14:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c39c613dd4f1e7dc6b3932e81bc2cf57 SHA-1: 16db1a3e7b4e142547bc57e1b4f42b8c4e0d4402 SHA-256: 1ec06614c6117254f996590585b57ff5a610ff3205b08783c029f4e21901c37c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee2a93b028---45555631239.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/7ea880aec5554af42023ace673995b12/sekuvoresenevobena.pdf
    • https://cornwallstaffagency.com/userfiles/file/pozex.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/dbffb8c98102111bf038a3f48e811af6/21218982075.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609544e5c34e6---kozenetifatugukebunalukub.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/5frqj5ci8akk395g54jo01db46/26453055988.pdf
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/43111802135.pdf
    • https://eternalbliss.net/file/28091966067.pdf
    • https://securityguardsupply.org/php/uploads/file/16241373134.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f0gap7039mb05sb033rodae0n0/gesekozu.pdf
    • http://massimosusto.eu/userfiles/files/16533902809.pdf
    • http://veoguidecostarica.com/ci/userfiles/files/posumidojiroso.pdf
    • https://airflow-skateboards.com/upload/file/49820949425.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608893ba3a993---fadaguveropagukesofogopi.pdf
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62657464240.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160822c4b93568---30539261829.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de0efe348c---56826686829.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/7c04f1c02289abe28127ab157fc4a9dc/nijedanaru.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609001bedc29e---11753928965.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e5a4ef4f---detuxupotudes.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+draw+a+duck+easy
    • 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_off0000e318.bin
d1a2fb59f82c457e2b8b61c36d9edc6f9f70df7f82a7e87689d7f79fb67d67cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE318 17332 bytes
font_01_sfnt_off00011068.bin
85a2952b9ec45383b8346eac1c67184571abc1340aecf25fe5008ea4304d3faa
pdf-font-stream PDF embedded font (sfnt) at offset 0x11068 10504 bytes
font_02_sfnt_off0001288a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1288A 16792 bytes